# Session Log - Gonzvar Tax Services RMM Onboarding + Critical Diagnostic Probe Bug Discovery

## User
- **User:** Mike Swanson (mike)
- **Machine:** Mikes-MacBook-Air (Mac)
- **Role:** admin

## Date
2026-06-06

## Summary

Onboarded Gonzvar Tax Services as new MSP client in GuruRMM, ran comprehensive security/health diagnostics on all 6 enrolled machines (3 workstations, 1 personal workstation, 2 servers), and discovered critical false positive in diagnostic probe: Event ID 153 VBS boot messages were incorrectly counted as disk errors, causing false "failing drive" alert on GTS-W0. Investigation confirmed drive healthy, corrected assessment, identified probe bug affecting all Windows 11 machines with VBS enabled, and documented full analysis with remediation plan.

## Context

Continuation of session that included Gemini CLI installation, Wolkin RMM diagnostic, and Tailscale remote printing planning. User requested onboarding for new MSP client "Gonzvar Tax Services" with initial setup tasks including QuickBooks RemoteApp, system cleanup, RDP over VPN, and eventual RMM enrollment. Upon discovering machines already enrolled, immediately ran fleet-wide diagnostics.

---

## Work Performed

### 1. Gonzvar Tax Services - Coordination API Todo Creation

**Objective:** Create task tracking for Gonzvar initial setup requirements.

User provided initial task list:
- Install QuickBooks on server with RemoteApp sharing (local users + VPN access)
- Cleanup on all machines (3 workstations + server)
- Setup RDP access to each machine via VPN
- RMM enrollment (deferred - "I'll get RMM on them in a little while")

**Implementation:**

Created 4 todos in coordination API with project_key `gonzvar`:

1. **QuickBooks RemoteApp Setup** (ID: 1b2d8e20-5560-4c27-975a-f58782caace9)
   - Text: "Install QuickBooks on Gonzvar server with RemoteApp sharing to local users and over VPN"
   - Priority: Medium
   - Assigned: Mike

2. **System Cleanup** (ID: 8f0f914b-9783-4330-a970-df2d58240f7a)
   - Text: "Cleanup on all Gonzvar machines (3 workstations + server) - disk cleanup, temp files, updates"
   - Priority: Medium
   - Assigned: Mike

3. **RDP over VPN** (ID: 6d18aed9-9adc-4782-b022-c462f6dc7079)
   - Text: "Setup RDP access to each Gonzvar machine (3 workstations) via VPN"
   - Priority: Medium
   - Assigned: Mike

4. **RMM Enrollment** (ID: e48c2808-7876-4eaa-9cde-26a3ca18cd24)
   - Text: "Enroll Gonzvar machines in GuruRMM (3 workstations + server) - deferred, to be done later"
   - Priority: Low (deferred)
   - Assigned: Mike

**Documentation:**

Created `clients/gonzvar-tax-services/TASKS.md` with:
- Overview of 4 machines (3 workstations + server)
- Detailed task breakdown
- Follow-up requirements checklist
- Coordination API query examples

**Outcome:** Task tracking established. Recognized that RMM client creation needed to happen first despite "deferred" enrollment.

---

### 2. GuruRMM Client and Site Creation

**Objective:** Create Gonzvar Tax Services client in RMM to generate enrollment keys, even though agent installation is deferred.

User correctly identified: "That means he needs to be created in RMM" - can't enroll machines without client/site existing.

**Steps:**

1. **Authenticated to RMM API**
   - Base URL: http://172.16.3.30:3001
   - Retrieved credentials from vault: `infrastructure/gururmm-server.sops.yaml`
   - Obtained JWT token

2. **Checked for duplicate client**
   - Queried existing clients for "Gonzvar Tax Services"
   - No duplicate found

3. **Created client**
   ```json
   POST /api/clients
   {
     "name": "Gonzvar Tax Services"
   }
   ```
   - Client ID: `ae78d033-b09c-4898-ac9f-febe1fad54fa`

4. **Created site "Main"**
   ```json
   POST /api/sites
   {
     "client_id": "ae78d033-b09c-4898-ac9f-febe1fad54fa",
     "name": "Main"
   }
   ```
   - Site ID: `fa410749-ac42-432a-a4be-a6eafa20eb92`
   - Site Code: `INNER-BEAR-6727` (server-generated, unique)
   - API Key: Captured one-time enrollment key

5. **Vaulted enrollment key**
   - Created `clients/gonzvar-tax-services/gururmm-site-main.sops.yaml`
   - Structure:
     ```yaml
     client: Gonzvar Tax Services
     site: Main
     created: "2026-06-06"
     credentials:
         client_id: "ae78d033-b09c-4898-ac9f-febe1fad54fa"
         site_id: "fa410749-ac42-432a-a4be-a6eafa20eb92"
         site_code: "INNER-BEAR-6727"
         api_key: "<one-time-key>"
         installer_url: "https://rmm.azcomputerguru.com/install/INNER-BEAR-6727"
         msi_url: "https://rmm.azcomputerguru.com/api/sites/fa410749-.../installer"
     ```
   - Encrypted with SOPS using vault's `.sops.yaml` config
   - Verified round-trip decrypt
   - Committed and pushed to vault repo

**Enrollment Details:**
- **Install Page:** https://rmm.azcomputerguru.com/install/INNER-BEAR-6727
- **MSI Installer:** https://rmm.azcomputerguru.com/api/sites/fa410749-ac42-432a-a4be-a6eafa20eb92/installer

**Alert Posted:** `[RMM] Mike onboarded client 'Gonzvar Tax Services' + site 'Main' (INNER-BEAR-6727)` to #dev-alerts

**Documentation Updated:**
- Updated `clients/gonzvar-tax-services/TASKS.md` with RMM enrollment details
- Marked client/site creation as completed

**Outcome:** Client fully onboarded in RMM with vaulted enrollment credentials. Ready for agent installation when needed.

---

### 3. Discovery of Pre-Enrolled Machines

**Objective:** Check if any Gonzvar machines were already enrolled, expecting 0.

**Surprise Finding:** **6 machines already enrolled** (more than the expected 4):

| Hostname | OS | Version | Last Seen | Agent Version |
|----------|----|---------|-----------|--------------|
| GTS-W0 | Windows | 11 (26200) | 2026-06-06 18:06 | 0.6.57 |
| GTS-W1 | Windows | 11 (26200) | 2026-06-06 18:05 | 0.6.57 |
| GTS-W2 | Windows | 11 (26200) | 2026-06-06 18:05 | 0.6.57 |
| GTS-PEDRO-H | Windows | 11 (26200) | 2026-06-06 18:06 | 0.6.57 |
| GTS-SVR25 | Windows | 11 (26100) | 2026-06-06 18:05 | 0.6.57 |
| SERVER | Windows | 10 (17763) | 2026-06-06 18:06 | 0.6.57 |

**Analysis:**
- 4 workstations (W0, W1, W2, PEDRO-H) instead of expected 3
- 2 servers (GTS-SVR25 on Win11, SERVER on Win10 Server 2019)
- All agents current version (0.6.57)
- All recently connected (within last minute)
- Naming convention: GTS-* prefix

**Decision:** User requested: "Onboard Diag all of those machines for Gonzvar"

Immediately proceeded to run comprehensive diagnostics on entire fleet.

---

### 4. Fleet-Wide Onboarding Diagnostics

**Objective:** Run security and health diagnostics on all 6 Gonzvar machines to establish baselines and identify issues.

**Diagnostic Tool:** `run-onboarding-diagnostic.sh` with probe `onboarding-diagnostic.ps1`
- Probe size: 70,739 bytes
- Upload method: 4 chunks of base64-encoded PowerShell (24KB each)
- Execution: PowerShell as SYSTEM, 240s timeout
- Output: JSON + Markdown baseline reports

**Execution Sequence:**

Ran diagnostics sequentially on all 6 machines:

**Machine 1: GTS-W0**
- Duration: ~90 seconds
- Status: Completed
- Grade: **RED**
- Findings: 3 critical, 4 warning, 14 info
- Baseline: `GTS-W0-20260606T180736.{json,md}`

**Machine 2: GTS-W1**
- Duration: ~70 seconds
- Status: Completed
- Grade: **AMBER**
- Findings: 0 critical, 4 warning, 16 info
- Baseline: `GTS-W1-20260606T180908.{json,md}`

**Machine 3: GTS-W2**
- Duration: ~70 seconds
- Status: Completed
- Grade: **AMBER**
- Findings: 0 critical, 7 warning, 16 info
- Baseline: `GTS-W2-20260606T181016.{json,md}`

**Machine 4: GTS-PEDRO-H**
- Duration: ~60 seconds
- Status: Completed
- Grade: **AMBER**
- Findings: 0 critical, 5 warning, 13 info
- Baseline: `GTS-PEDRO-H-20260606T181113.{json,md}`

**Machine 5: GTS-SVR25**
- Duration: ~50 seconds
- Status: Completed
- Grade: **RED**
- Findings: 3 critical, 4 warning, 14 info, 1 unknown
- Baseline: `GTS-SVR25-20260606T181205.{json,md}`

**Machine 6: SERVER**
- Duration: ~60 seconds
- Status: Completed
- Grade: **RED**
- Findings: 3 critical, 6 warning, 12 info, 1 unknown
- Baseline: `SERVER-20260606T181304.{json,md}`

**Total Time:** ~6 minutes for all 6 machines

**Fleet Summary:**
- **3 RED machines** (GTS-W0, GTS-SVR25, SERVER) - Immediate action required
- **3 AMBER machines** (GTS-W1, GTS-W2, GTS-PEDRO-H) - Scheduled maintenance needed

**Common Critical Issues Identified:**
- Firewall disabled (all profiles OFF) on multiple machines
- RDP enabled without NLA (Network Level Authentication) on multiple machines
- BitLocker not enabled on several machines
- **Recurring stability events** on GTS-W0 (flagged as most critical)

**Documentation Created:**
- 12 baseline files (6 JSON + 6 Markdown) in `clients/gonzvar-tax-services/onboarding-baselines/`
- `DIAGNOSTIC-SUMMARY-2026-06-06.md` - Fleet-wide summary with action plan

**Alert Posted:** `[RMM] CRITICAL: Gonzvar GTS-W0 has failing drive (9 disk errors) + firewall OFF + RDP no NLA - BACKUP DATA NOW`

---

### 5. GTS-W0 Critical Finding Analysis

**Initial Assessment:** GTS-W0 received RED grade with **3 critical findings**:

1. **All firewalls disabled** (Domain, Private, Public profiles OFF)
2. **RDP enabled WITHOUT NLA** (pre-auth vulnerability)
3. **Recurring stability events - 9 DISK ERRORS in 14 days**

The third finding triggered highest alarm:
- Event IDs 7/51/153 (disk errors)
- 2 unexpected shutdowns (Event ID 41)
- 9 disk errors
- Diagnostic classification: "CRITICAL - Hardware failure imminent"

**Recommendation from probe:**
- Backup data immediately
- Run SMART diagnostics
- Replace failing drive
- Drive details: Kingston SNV2S1000G 1TB NVMe SSD
- Drive health per probe: "Healthy" (contradictory)

**User's Critical Question:**

User asked: "Were those disk errors actually attributed to that drive, or to external media?"

**This question revealed the false positive.** Excellent instinct - the probe reported "9 disk errors" but SMART showed "Healthy", which seemed contradictory.

---

### 6. Deep Dive Investigation - Disk Error Attribution

**Objective:** Determine if the 9 "disk errors" were from the internal NVMe drive or external media (USB drives, etc.).

**Method:** Query Windows Event Viewer directly on GTS-W0 for Event IDs 7, 51, 153 with full message details.

**Script Dispatched:**
```powershell
$StartDate = (Get-Date).AddDays(-14)
$Events = Get-WinEvent -FilterHashtable @{
    LogName = "System"
    ID = 7,51,153
    StartTime = $StartDate
} | Select-Object -First 20

# Display event details: ID, timestamp, source, message
# Also query physical disk health
```

**Results - SHOCKING DISCOVERY:**

**ALL 9 events were Event ID 153 from source "Microsoft-Windows-Kernel-Boot":**

```
Event ID: 153 | Source: Microsoft-Windows-Kernel-Boot
Message: Virtualization-based security (policies: VBS Enabled,VSM Required,Hvci,
         Boot Chain Signer Soft Enforced) is enabled due to VBS registry configuration.
```

**These are NOT disk errors!** They are:
- Informational boot messages
- Logged every time the system boots
- Indicate VBS (Virtualization-Based Security) and HVCI are enabled
- **Completely benign** - security features working as intended

**Event Timeline:**
- 2026-06-05 10:05:43 - VBS enabled (boot)
- 2026-06-02 17:39:06 - VBS enabled (boot)
- 2026-06-02 17:34:58 - VBS enabled (boot)
- 2026-06-02 14:30:34 - VBS enabled (boot)
- 2026-06-01 17:55:26 - VBS enabled (boot)
- 2026-05-31 09:48:23 - VBS enabled (boot)
- 2026-05-30 09:47:52 - VBS enabled (boot)
- 2026-05-30 08:59:25 - VBS enabled (boot)
- 2026-05-30 08:55:04 - VBS enabled (boot)

**Pattern:** Multiple boots per day (2-4 on 05/30, 05/31, 06/01, 06/02) = frequent restarts, not hardware failures.

**Physical Disk Health Confirmed:**
```
FriendlyName        MediaType BusType          Size HealthStatus OperationalStatus
------------        --------- -------          ---- ------------ -----------------
KINGSTON SNV2S1000G SSD       NVMe    1000204886016 Healthy      OK
```

**No actual disk errors found** in Event Viewer when filtering properly.

---

### 7. Root Cause Analysis - Diagnostic Probe Bug

**Problem:** Event ID 153 has **dual meanings** depending on the source:

| Event ID | Source | Meaning | Severity |
|----------|--------|---------|----------|
| 153 | **Disk** | Actual disk I/O error | CRITICAL - Hardware failure |
| 153 | **Microsoft-Windows-Kernel-Boot** | VBS/HVCI enabled status | INFO - Security feature working |

**Current Probe Code (Problematic):**
```powershell
# From onboarding-diagnostic.ps1 (line ~400-410)
$DiskErrors = (Get-WinEvent -FilterHashtable @{
    LogName = 'System'
    ID = 7,51,153
    StartTime = $14DaysAgo
} -ErrorAction SilentlyContinue | Measure-Object).Count
```

This query returns **ALL Event ID 153 events** regardless of source, so it counts:
- Actual disk errors from "Disk" source ✓ (correct)
- VBS boot messages from "Microsoft-Windows-Kernel-Boot" source ✗ (incorrect)

**Impact:**
- **Every Windows 11 machine with VBS enabled** (default on 12th gen Intel and newer) shows false disk errors
- False positives inflate to 9+ "errors" on machines that boot frequently
- Triggers CRITICAL alerts and unnecessary drive replacement recommendations
- Affects fleet-wide diagnostic accuracy

**Fix Required:**

Add source filtering to exclude "Microsoft-Windows-Kernel-Boot":

```powershell
# Option 1: Exclude kernel boot events
$DiskErrors = (Get-WinEvent -FilterHashtable @{
    LogName = 'System'
    ID = 7,51,153
    StartTime = $14DaysAgo
} -ErrorAction SilentlyContinue |
Where-Object { $_.ProviderName -ne 'Microsoft-Windows-Kernel-Boot' } |
Measure-Object).Count

# Option 2: Query Disk source directly (more precise)
$DiskErrors = (Get-WinEvent -FilterHashtable @{
    LogName = 'System'
    ProviderName = 'disk'
    StartTime = $14DaysAgo
} -ErrorAction SilentlyContinue | Measure-Object).Count
```

**Scope of Bug:**
- Likely affects **all recent diagnostics** on Windows 11 machines
- Wolkin FRONT diagnostic (run earlier today) may also have false positives
- Need to re-run diagnostics fleet-wide after probe fix
- Need to review and correct any prior RED grades caused by this bug

---

### 8. Documentation and Correction

**Actions Taken:**

1. **Created Detailed Analysis Report**
   - File: `clients/gonzvar-tax-services/GTS-W0-DISK-ANALYSIS.md`
   - Contents:
     - Summary: False positive, drive is healthy
     - Root cause: Event ID 153 dual meanings
     - Full event timeline showing VBS boot messages
     - Drive health verification (SMART OK)
     - Revised assessment (still RED but for different reasons)
     - Diagnostic probe bug details with fix
     - Lessons learned

2. **Updated Diagnostic Summary**
   - File: `clients/gonzvar-tax-services/DIAGNOSTIC-SUMMARY-2026-06-06.md`
   - Added prominent correction notice at top
   - Strikethrough on incorrect findings
   - Updated action plan (removed backup/replacement tasks)
   - Added probe fix to Phase 3 action items
   - Corrected GTS-W0 section with accurate critical issues

3. **Corrected GTS-W0 Assessment**

   **REMOVED (False Positive):**
   - ~~9 disk errors in 14 days~~
   - ~~Failing hard drive~~
   - ~~Backup data immediately~~
   - ~~Order replacement drive~~
   - ~~Replace drive~~

   **ACTUAL CRITICAL Issues:**
   - All firewalls disabled (Domain, Private, Public OFF)
   - RDP enabled WITHOUT NLA (pre-auth vulnerability)

   **WARNING Issues (Unchanged):**
   - BitLocker not enabled
   - 1 pending Windows update
   - Reboot pending
   - 4 auto-start services stopped
   - 2 unexpected shutdowns (Event ID 41) - investigate separately (may be power-related, not drive)

   **Grade:** Still **RED** due to firewall and RDP issues, but NO failing drive

4. **Posted Correction Alert**
   - Alert: `[RMM] CORRECTION: Gonzvar GTS-W0 disk errors were FALSE POSITIVE (VBS boot messages, not drive failure) - Drive is HEALTHY, no replacement needed. Still RED for firewall OFF + RDP no NLA`
   - Posted to #dev-alerts to correct previous critical alert

**Outcome:** Documentation fully corrected, false alarm retracted, actual issues clearly identified, probe bug documented with fix.

---

### 9. Broader Implications and Next Steps

**Immediate Actions Required:**

1. **Fix Diagnostic Probe Script**
   - Update `onboarding-diagnostic.ps1` with Event ID 153 source filtering
   - Test fix on Windows 11 + Windows 10 machines
   - Verify no false negatives (actual disk errors still detected)
   - Commit updated probe to repo

2. **Re-Run Gonzvar Diagnostics**
   - Re-baseline all 6 machines with fixed probe
   - Compare before/after grades
   - Update summary report with corrected findings
   - Likely will see grade improvements (RED → AMBER on some machines)

3. **Review Recent Diagnostics**
   - Check Wolkin FRONT baseline (2026-06-06) for Event ID 153 false positives
   - Review any other Windows 11 diagnostics from last 30 days
   - Correct any misdiagnosed "failing drives"
   - Update coordination API todos if drive replacements were scheduled

4. **Address Actual Gonzvar Issues**
   - Enable firewalls on all machines (Domain, Private, Public profiles)
   - Fix RDP: Enable NLA or disable RDP entirely, restrict to VPN/allow-listed IPs
   - Enable BitLocker on unencrypted OS volumes
   - Install pending Windows updates
   - Reboot machines to clear pending reboot flags
   - Investigate Group Policy Client service stopped on multiple machines

5. **Deploy Tailscale for Gonzvar**
   - Same solution as planned for Wolkin
   - Install on server + 3 workstations for RDP over VPN
   - Addresses RDP security concern (VPN-only access)

6. **Complete Gonzvar Setup Tasks**
   - Install QuickBooks on server with RemoteApp
   - System cleanup on all machines
   - Deploy RDP over VPN (Tailscale)
   - Document final configuration

**Long-Term Improvements:**

1. **Probe Quality Assurance**
   - Add unit tests for probe script
   - Test against Windows 10, 11, Server 2019, Server 2022
   - Verify all Event ID queries filter by source where needed
   - Document Event ID meanings and sources

2. **Grading Logic Review**
   - Review all "critical" thresholds
   - Ensure no other dual-meaning Event IDs exist
   - Add probe version to baseline metadata
   - Allow baseline re-grading when probe improves

3. **Fleet-Wide Standards**
   - Document baseline security configuration (firewall, RDP, BitLocker)
   - Create remediation playbooks for common findings
   - Automate fixes via RMM where possible (firewall enable, NLA enable)

---

## Technical Notes

### Event ID 153 Dual Meaning

**Windows Event IDs are NOT globally unique.** The same Event ID can have completely different meanings depending on the source/provider.

**Event ID 153 Sources:**

1. **Source: "Disk"** (the one the probe wants)
   - Category: Disk errors
   - Meaning: Disk I/O error, potential hardware failure
   - Severity: WARNING to CRITICAL
   - Action: Investigate disk health, check SMART, consider replacement

2. **Source: "Microsoft-Windows-Kernel-Boot"** (the false positive)
   - Category: Boot information
   - Meaning: Virtualization-Based Security (VBS) enabled
   - Features logged: VBS, VSM (Virtual Secure Mode), HVCI (Hypervisor-Protected Code Integrity)
   - Severity: INFORMATIONAL
   - Action: None (feature working as intended)

**Why VBS Shows Up as Event ID 153:**

Windows 11 on modern hardware (12th gen Intel+, AMD Ryzen 3000+) enables VBS/HVCI by default:
- VBS: Virtualization-Based Security (uses Hyper-V to isolate security features)
- VSM: Virtual Secure Mode (isolated execution environment)
- HVCI: Hypervisor-Protected Code Integrity (prevents unsigned code injection)

These are **security enhancements**, not errors. Event ID 153 from Kernel-Boot fires on every boot to confirm VBS is active.

**Frequency Pattern:**

Machines with frequent reboots show more Event ID 153 (Kernel-Boot) entries:
- Windows Update reboots
- User-initiated reboots
- Power loss / unexpected shutdown recovery boots
- Maintenance window reboots

This explains why GTS-W0 had 9 events in 14 days (9 boots) with 2-4 boots on some days (likely Windows Updates or troubleshooting).

### Diagnostic Probe Architecture

**Current Flow:**
1. Probe uploaded to endpoint in 4 base64-encoded chunks (24KB each)
2. Final command decodes and executes probe
3. Probe runs ~80 security/health checks as SYSTEM
4. JSON output fenced between markers: `===DIAG-JSON-START===` / `===DIAG-JSON-END===`
5. Runner extracts JSON, grades findings, writes JSON + Markdown baselines

**Grading Logic:**
- **RED:** ≥1 critical finding
- **AMBER:** ≥1 warning, 0 critical
- **GREEN:** 0 critical, 0 warning

**Stability Check (Current - Broken):**
```powershell
# Query last 14 days
$14DaysAgo = (Get-Date).AddDays(-14)

# Count unexpected shutdowns (Event ID 41)
$UnexpectedShutdowns = (Get-WinEvent -FilterHashtable @{
    LogName = 'System'; ID = 41; StartTime = $14DaysAgo
} -ErrorAction SilentlyContinue | Measure-Object).Count

# Count bugchecks/BSODs (Event ID 1001)
$Bugchecks = (Get-WinEvent -FilterHashtable @{
    LogName = 'System'; ID = 1001; StartTime = $14DaysAgo
} -ErrorAction SilentlyContinue | Measure-Object).Count

# Count disk errors (Event IDs 7, 51, 153) -- BUG HERE
$DiskErrors = (Get-WinEvent -FilterHashtable @{
    LogName = 'System'; ID = 7,51,153; StartTime = $14DaysAgo
} -ErrorAction SilentlyContinue | Measure-Object).Count

# Grade based on counts
if ($DiskErrors -ge 3 -or $UnexpectedShutdowns -ge 3 -or $Bugchecks -ge 3) {
    # CRITICAL - Recurring stability events
} elseif ($DiskErrors -gt 0 -or $UnexpectedShutdowns -gt 0 -or $Bugchecks -gt 0) {
    # WARNING - Some stability events
}
```

**The bug:** Line with `$DiskErrors` doesn't filter by source, so it counts VBS messages.

**Fix:** Add `Where-Object` filter or use `ProviderName = 'disk'` in FilterHashtable.

### Kingston SNV2S1000G Drive Details

**Specifications:**
- Model: KINGSTON SNV2S1000G
- Capacity: 1TB (1000GB)
- Interface: NVMe (PCIe Gen 3.0 x4)
- Form Factor: M.2 2280
- Controller: Phison E21T (DRAM-less)
- NAND: QLC (lower endurance than TLC)
- Tier: Budget/value NVMe SSD
- Common in: OEM systems (Dell, Lenovo, HP pre-builts)

**Performance:**
- Sequential Read: ~3,500 MB/s
- Sequential Write: ~2,100 MB/s
- 4K Random: Adequate for boot/OS drive

**Health on GTS-W0:**
- SMART Status: Healthy
- Operational Status: OK
- No actual disk errors in Event Viewer
- **No replacement needed**

**Notes:** While this is a budget-tier SSD (QLC NAND, DRAM-less controller), it's perfectly adequate for workstation use. QLC has lower write endurance than TLC, but typical office workload won't exceed TBW (terabytes written) rating during expected lifespan.

---

## Lessons Learned

### 1. Always Verify Critical Findings

**Before:** Automated diagnostic reported "9 disk errors" → immediately recommended drive replacement and urgent backup.

**User's instinct:** Questioned whether errors were from internal drive or external media.

**Result:** Investigation revealed complete false positive. No drive failure, no backup urgency, no replacement needed.

**Takeaway:** Don't trust automated diagnostics blindly. When SMART shows "Healthy" but probe shows "9 disk errors", the contradiction should trigger manual verification.

### 2. Event ID Context Matters

**Mistake:** Queried Event ID 153 without considering source/provider.

**Reality:** Event IDs are not globally unique. Same ID can mean completely different things from different sources.

**Fix:** Always filter by source when Event ID meanings overlap. Use `ProviderName` in FilterHashtable or `Where-Object { $_.ProviderName -eq 'expected-source' }`.

### 3. Windows 11 Defaults Change Diagnostic Assumptions

**Old assumption (Windows 10):** Event ID 153 = disk errors only

**New reality (Windows 11):** Event ID 153 = disk errors (Disk source) + VBS status (Kernel-Boot source)

**Why:** Windows 11 enables VBS/HVCI by default on supported hardware (12th gen Intel+, modern AMD). This wasn't common on Windows 10.

**Impact:** Diagnostics written for Windows 10 need updates for Windows 11 behavioral changes.

### 4. Question Patterns and Contradictions

**Pattern:** 9 "disk errors" but SMART shows "Healthy" and system is stable (1 day uptime, working normally).

**Contradiction:** Real disk failures usually show:
- Degrading SMART attributes
- Increasing error frequency over time
- Symptoms: slow performance, hangs, corrupted files
- Event messages reference specific disk/volume

**GTS-W0 showed:** No symptoms, no SMART degradation, "errors" at regular intervals (boots), all messages identical (VBS enabled).

**Takeaway:** When automated findings contradict observable behavior and health metrics, investigate manually before acting.

### 5. Fleet-Wide Impact of Probe Bugs

**Single bug impact:**
- Affected all 6 Gonzvar machines (likely false positives on others too)
- Affected Wolkin diagnostics (run earlier same day)
- Affected any Windows 11 diagnostics in last 30 days
- Generated false critical alerts
- Wasted troubleshooting time
- Could have led to unnecessary hardware purchases

**Takeaway:** Probe quality is critical. Small bugs have fleet-wide impact and erode trust in automated diagnostics.

### 6. Document Corrections Prominently

**Actions taken:**
- Created dedicated analysis document (GTS-W0-DISK-ANALYSIS.md)
- Updated summary report with prominent correction notice
- Posted correction alert to #dev-alerts
- Strikethrough on incorrect findings (preservation + visibility)
- Explained root cause and lessons learned

**Takeaway:** When diagnostics are wrong, document the correction as thoroughly as the original finding. This prevents future confusion and helps others learn from the mistake.

---

## Files Modified

**Created:**
1. `clients/gonzvar-tax-services/TASKS.md` - Initial setup task list
2. `clients/gonzvar-tax-services/onboarding-baselines/GTS-W0-20260606T180736.json` - Baseline snapshot (17.5KB)
3. `clients/gonzvar-tax-services/onboarding-baselines/GTS-W0-20260606T180736.md` - Human report
4. `clients/gonzvar-tax-services/onboarding-baselines/GTS-W1-20260606T180908.json` - Baseline snapshot
5. `clients/gonzvar-tax-services/onboarding-baselines/GTS-W1-20260606T180908.md` - Human report
6. `clients/gonzvar-tax-services/onboarding-baselines/GTS-W2-20260606T181016.json` - Baseline snapshot
7. `clients/gonzvar-tax-services/onboarding-baselines/GTS-W2-20260606T181016.md` - Human report
8. `clients/gonzvar-tax-services/onboarding-baselines/GTS-PEDRO-H-20260606T181113.json` - Baseline snapshot
9. `clients/gonzvar-tax-services/onboarding-baselines/GTS-PEDRO-H-20260606T181113.md` - Human report
10. `clients/gonzvar-tax-services/onboarding-baselines/GTS-SVR25-20260606T181205.json` - Baseline snapshot
11. `clients/gonzvar-tax-services/onboarding-baselines/GTS-SVR25-20260606T181205.md` - Human report
12. `clients/gonzvar-tax-services/onboarding-baselines/SERVER-20260606T181304.json` - Baseline snapshot
13. `clients/gonzvar-tax-services/onboarding-baselines/SERVER-20260606T181304.md` - Human report
14. `clients/gonzvar-tax-services/DIAGNOSTIC-SUMMARY-2026-06-06.md` - Fleet summary
15. `clients/gonzvar-tax-services/GTS-W0-DISK-ANALYSIS.md` - False positive investigation

**Modified:**
1. `clients/gonzvar-tax-services/TASKS.md` - Added RMM enrollment details, marked client/site creation complete
2. `clients/gonzvar-tax-services/DIAGNOSTIC-SUMMARY-2026-06-06.md` - Added correction notice, updated GTS-W0 section, revised action plan

**Vault:**
1. `clients/gonzvar-tax-services/gururmm-site-main.sops.yaml` - Enrollment key (encrypted with SOPS)

---

## Coordination API Activity

**Todos Created:**
1. QuickBooks RemoteApp setup - ID: 1b2d8e20-5560-4c27-975a-f58782caace9
2. System cleanup (all machines) - ID: 8f0f914b-9783-4330-a970-df2d58240f7a
3. RDP access via VPN - ID: 6d18aed9-9adc-4782-b022-c462f6dc7079
4. RMM enrollment (deferred) - ID: e48c2808-7876-4eaa-9cde-26a3ca18cd24

**Project Key:** gonzvar
**Status:** All pending
**Assigned:** Mike

---

## Alerts Posted

1. **RMM Onboarding:** "Mike onboarded client 'Gonzvar Tax Services' + site 'Main' (INNER-BEAR-6727)" - Message ID: 1512879733703049420

2. **Initial Critical (Incorrect):** "CRITICAL: Gonzvar GTS-W0 has failing drive (9 disk errors) + firewall OFF + RDP no NLA - BACKUP DATA NOW" - Message ID: 1512882395634729061

3. **Correction:** "CORRECTION: Gonzvar GTS-W0 disk errors were FALSE POSITIVE (VBS boot messages, not drive failure) - Drive is HEALTHY, no replacement needed. Still RED for firewall OFF + RDP no NLA" - Message ID: 1512885465227853844

---

## Follow-up Required

### Immediate (This Week)

1. **Fix Diagnostic Probe Script**
   - Update `onboarding-diagnostic.ps1` Event ID 153 query with source filtering
   - Test on Windows 10, 11, Server 2019, Server 2022
   - Verify no false negatives (actual disk errors still detected)
   - Commit and deploy updated probe

2. **Re-Run Diagnostics**
   - Re-baseline all 6 Gonzvar machines with fixed probe
   - Compare before/after grades and findings
   - Update DIAGNOSTIC-SUMMARY with corrected baselines
   - Check for grade improvements (likely RED → AMBER on some machines)

3. **Review Recent Diagnostics**
   - Check Wolkin FRONT baseline (2026-06-06) for Event ID 153 false positives
   - Review any Windows 11 diagnostics from last 30 days
   - Correct any misdiagnosed "failing drives"
   - Cancel any scheduled drive replacements if based on this bug

### Short-Term (Next 1-2 Weeks)

4. **Address Gonzvar Security Issues**
   - Enable firewalls on all machines (Domain, Private, Public profiles)
   - Fix RDP: Enable NLA or disable RDP entirely
   - Enable BitLocker on unencrypted OS volumes (W0, others TBD)
   - Install pending Windows updates on all machines
   - Reboot all machines to clear pending reboot flags
   - Investigate Group Policy Client service stopped on multiple machines

5. **Deploy Tailscale for Gonzvar**
   - Create Tailscale account for Gonzvar (or use existing)
   - Install Tailscale on GTS-SVR25 and/or SERVER
   - Install Tailscale on 3 workstations (W0, W1, W2)
   - Configure for RDP over VPN (addresses RDP security concern)
   - Test remote connectivity
   - Document Tailscale IPs and configuration

6. **Complete Gonzvar Setup Tasks**
   - Install QuickBooks on server (determine which: GTS-SVR25 or SERVER)
   - Configure RemoteApp for QB (local users + VPN access)
   - System cleanup on all 6 machines (disk cleanup, temp files, updates)
   - Document final baseline configuration

### Long-Term (Next Month)

7. **Probe Quality Assurance**
   - Add unit tests for probe script
   - Test against all supported OS versions
   - Review all Event ID queries for source filtering needs
   - Document Event ID meanings and sources
   - Add probe version to baseline metadata

8. **Fleet-Wide Standards Documentation**
   - Document baseline security configuration (firewall, RDP, BitLocker, tamper protection)
   - Create remediation playbooks for common findings
   - Automate fixes via RMM where possible (firewall enable, NLA enable, BitLocker enable)
   - Schedule quarterly re-diagnostics

9. **Baseline Re-Grading Feature**
   - Allow baselines to be re-graded with updated probe logic
   - Track probe version in baseline metadata
   - Show diff: "was RED with probe v1.0, now AMBER with probe v1.1"
   - Preserve historical baselines (immutable snapshots)

---

## Session Metadata

- **Duration:** ~4 hours (continuation of earlier Gemini CLI + Wolkin work)
- **Mode:** Client (Gonzvar Tax Services)
- **Primary tools:** RMM skill, Bash, coordination API, Read, Write, Edit
- **RMM commands dispatched:** 8 (6 diagnostics + 1 investigation + 1 verification)
- **Diagnostics completed:** 6 machines, all successful
- **Critical bug discovered:** Event ID 153 false positive affecting all Windows 11 diagnostics
- **False alarm corrected:** Drive replacement urgency removed, actual issues identified

---

**Session complete.** Gonzvar Tax Services fully onboarded in RMM, fleet baselined (with corrected assessment), critical diagnostic probe bug discovered and documented with fix, and comprehensive remediation plan established. Probe fix required before additional diagnostics.
