claudetools/clients/rednour/session-logs/2026-06/2026-06-26-howard-nick-mac-rmm-rootcause.md

User

• User: Howard Enos (howard)
• Machine: Howard-Home
• Role: tech

Session Summary

Re-opened the deferred GuruRMM macOS-agent enrollment failure on Nick Pafford's Apple Silicon Mac at Rednour Law Offices (open item from the 2026-06-25 session). Howard is heading onsite and wanted the problem diagnosed and a fix pre-staged before arrival. The device was offline (present in ScreenConnect but not connected), so no live commands could be run against it — all diagnosis was done from the repo and the RMM server endpoints.

Disproved the prior working hypothesis. The 2026-06-25 log, the wiki, and coord todo 6f2d22be all recorded the cause as "served aarch64 binary is unsigned, so Apple Silicon SIGKILLs it (killed: 9)." Pulled the actual served binary from https://rmm.azcomputerguru.com/install/GREEN-FALCON-7214/download/macos (3,960,397 bytes, single-arch arm64) and parsed its Mach-O load commands directly: it carries an LC_CODE_SIGNATURE and a valid CodeDirectory with the adhoc flag set (linker-inserted ad-hoc signature, identifier gururmm_agent-51a9f25b57c13649). An ad-hoc-signed arm64 binary satisfies Apple Silicon's AMFI and runs — so the unsigned/SIGKILL theory is wrong. All six linked dylibs are stock system frameworks (Security, CoreFoundation, libobjc, IOKit, libiconv, libSystem), ruling out a dyld "library not loaded" failure too. Howard recalled the actual error was a "file not found," which is consistent with this.

Found the real root cause by reading the agent and server source. The server's enrollment endpoint (server/src/api/enroll.rs) types EnrollRequest.site_id as uuid::Uuid — it requires a UUID. The server-served macOS install script (https://rmm.azcomputerguru.com/install/GREEN-FALCON-7214/macos) writes the site code string GREEN-FALCON-7214 into /usr/local/etc/gururmm/site.plist as site_id. The agent reads that and POSTs site_id: "GREEN-FALCON-7214" to /api/enroll, which fails UUID deserialization (HTTP 422) — enrollment retries forever and the agent never connects. The .pkg postinstall writes a real UUID into the same plist, so the two macOS installers disagree and the curl-script path is the broken one. The "file not found" Howard saw is the secondary symptom: config.rs::default_config_path() has no macOS branch, so a manual gururmm-agent run with no readable plist falls back to the Linux path /etc/gururmm/config.toml, which does not exist on macOS -> "Failed to read config file".

Resolved the correct site UUID for Rednour's "Main" site via the RMM API (c7f5787c-8e71-45b3-841f-fa52436f7d26; client "Rednour Law Offices" 85f7cff4-d4db-48a8-b477-b8788122a361, active). Note this differs from the d008c7d4-... UUID hardcoded in the repo's .pkg postinstall, which belongs to a different/test site and must not be used for Rednour. Built a self-contained onsite Terminal paste-block that installs the agent, writes site.plist with the UUID (not the code), writes the LaunchDaemon, reloads, and verifies. Delivered it to Howard's Discord DMs (split to fit the 2000-char limit). Per Howard's instruction, did NOT update the wiki, coord todo, or message Mike with the proposed fix — all of that waits until the fix is verified onsite.

Key Decisions

• Verified the binary signature from the repo/server instead of trusting the recorded hypothesis. Parsing the Mach-O directly (load commands + CodeDirectory flags) overturned the "unsigned" theory without needing the offline Mac.
• Use the site UUID c7f5787c-... from the live RMM API, not the .pkg's hardcoded d008c7d4-.... The pkg UUID is for a different site; using it would enroll Nick's Mac into the wrong site (or fail).
• Onsite workaround = run the official installer, then overwrite the one bad value (code -> UUID) in site.plist and reload. Uses the server's known-good plumbing for everything except the buggy field. The Discord block writes the plist with the UUID from the start so it is idempotent even on a clean machine.
• Hold all wiki/coord/Mike updates until verified onsite (Howard's explicit call). The records still say "unsigned binary / codesign fix"; correcting them before proof would risk publishing a second unverified theory.
• Did not test enrollment from the workstation. POSTing to /api/enroll would create a junk enrolled_agents row for a fake hostname on production; the source already proves the UUID requirement, so a live test was unnecessary and avoided.

Problems Encountered

• Prior root-cause hypothesis was wrong and was propagated to three places (session log, wiki known-issues, coord todo 6f2d22be). Disproved via direct Mach-O inspection. Records intentionally left uncorrected pending onsite verification.
• First download URL guess 404'd. .../downloads/gururmm-agent-darwin-arm64 does not exist; the real route is /install/:site_code/download/macos (read from server/src/main.rs).
• Device offline in ScreenConnect — no live diagnostics possible; all work done from source + server endpoints, and the fix staged for Howard to run by hand onsite.
• Discord 2000-char limit — the paste-block message was 2,091 chars and rejected (code 50035). Split the prose header off the code block (1,933 chars) and sent separately.

Configuration Changes

No changes to client machines, the RMM server, or the repo were made this session (pure diagnosis + delivery). The agent on Nick's Mac was NOT modified — it was offline.

Pending (to be applied onsite by Howard): write /usr/local/etc/gururmm/site.plist with site_id = c7f5787c-8e71-45b3-841f-fa52436f7d26, plus the LaunchDaemon, via the delivered paste-block.

Credentials & Secrets

None created or discovered this session. The site enrollment code GREEN-FALCON-7214 and site UUID c7f5787c-8e71-45b3-841f-fa52436f7d26 are enrollment identifiers (not secrets); the agent obtains a per-agent key (agk_...) from the server only after a successful enroll.

Infrastructure & Servers

• Nick's Mac (target): ScreenConnect machine name DUXs-Mac-Studio; Apple Mac13,1 Mac Studio, Apple M1 Max (arm64); macOS 26.5.1; serial F6QR2PN2R6. Confirm this is actually Nick's box before enrolling (name suggests a "Dux" user).
• GuruRMM server: http://172.16.3.30:3001 (internal API used for site lookup); public install/download host https://rmm.azcomputerguru.com; agent enroll API https://rmm-api.azcomputerguru.com/api/enroll.
• Rednour "Main" site: UUID c7f5787c-8e71-45b3-841f-fa52436f7d26, code GREEN-FALCON-7214, active. Client "Rednour Law Offices" 85f7cff4-d4db-48a8-b477-b8788122a361.
• macOS agent install paths: binary /usr/local/bin/gururmm-agent; plist /usr/local/etc/gururmm/site.plist; LaunchDaemon /Library/LaunchDaemons/com.azcomputerguru.gururmm-agent.plist (label com.azcomputerguru.gururmm-agent, runs gururmm-agent run); log /usr/local/var/log/gururmm-agent.log.

Commands & Outputs

# Served arm64 binary IS signed (overturns "unsigned" theory)
curl -fsSL https://rmm.azcomputerguru.com/install/GREEN-FALCON-7214/download/macos -o agent
# Mach-O parse: magic feedfacf (64-bit arm64), LC_CODE_SIGNATURE present,
# CodeDirectory flags 0x20002 (adhoc set), identifier gururmm_agent-51a9f25b57c13649,
# no CMS blob -> linker ad-hoc signature (runs on Apple Silicon).
# Linked dylibs: Security, CoreFoundation, libobjc.A, IOKit, libiconv.2, libSystem.B (all stock).

# Root cause in source:
#   server/src/api/enroll.rs:29   pub site_id: uuid::Uuid   <- requires a UUID
#   install script writes <key>site_id</key><string>GREEN-FALCON-7214</string>  <- a CODE
#   => POST /api/enroll 422s, agent retries forever.
#   agent/src/config.rs default_config_path() has no macOS branch -> /etc/gururmm/config.toml
#   fallback => "Failed to read config file" (the observed "file not found").

# Resolve correct Rednour Main site UUID
eval "$(bash .claude/scripts/rmm-auth.sh)"   # RMM=http://172.16.3.30:3001
curl -fsS -H "Authorization: Bearer $TOKEN" "$RMM/api/sites/c7f5787c-8e71-45b3-841f-fa52436f7d26"
#   site: Main | client_id: 85f7cff4-... (Rednour Law Offices) | active: True

Onsite fix (delivered to Howard's Discord) — run in Terminal on the Mac:

sudo bash -c '
UUID="c7f5787c-8e71-45b3-841f-fa52436f7d26"
BIN="/usr/local/bin/gururmm-agent"; CFG="/usr/local/etc/gururmm/site.plist"
PLIST="/Library/LaunchDaemons/com.azcomputerguru.gururmm-agent.plist"
URL="https://rmm.azcomputerguru.com/install/GREEN-FALCON-7214/download/macos"
mkdir -p /usr/local/bin /usr/local/etc/gururmm /usr/local/var/log
curl -fsSL "$URL" -o "$BIN" && chmod +x "$BIN"
printf "%s\n" "<?xml version=\"1.0\"?><plist version=\"1.0\"><dict><key>site_id</key><string>$UUID</string></dict></plist>" > "$CFG"; chmod 600 "$CFG"
# (LaunchDaemon written per macos-install.sh), then:
launchctl bootout system "$PLIST" 2>/dev/null || true
launchctl bootstrap system "$PLIST"; launchctl enable system/com.azcomputerguru.gururmm-agent
sleep 6; tail -30 /usr/local/var/log/gururmm-agent.log; plutil -p "$CFG"
'
# (full canonical block, with the real plist XML + LaunchDaemon, is in Howard's Discord DM)

Pending / Incomplete Tasks

• Verify the fix onsite (Howard, next): run the delivered paste-block on Nick's Mac. Success = log shows "Enrollment complete - agent key persisted" + WS connect; plutil -p shows an agent_key; agent appears in dashboard under Rednour Law Offices -> Main. Watch for Killed: 9 (would mean signing theory is wrong) or Site not found/422 (UUID typo).
• After verification — correct the records (currently HELD): update wiki clients/rednour.md (remove the unsigned/codesign known-issue, replace with the code-vs-UUID enroll bug), close/annotate coord todo 6f2d22be, and file the bug for Mike.
• The actual code fix (for Mike): either the macOS install script should stamp the site UUID into site.plist (like the .pkg postinstall), or /api/enroll should accept a site code (the legacy register_legacy handler already resolves via get_site_by_code). Secondary: add a macOS branch to default_config_path() and finish the stubbed macOS install verb (main.rs returns "macOS launchd service installation is not yet implemented"). Until patched, every macOS enrollment needs the manual code->UUID step.
• Confirm DUXs-Mac-Studio is Nick's machine before enrolling.
• Carryover from 2026-06-25 (unchanged): Syncro #32343 billing (0.5h onsite), auto-reconnect of the Documents mount in Nick's Login Items, return visit for phone + printer.

Reference Information

• Coord todo: 6f2d22be-e653-48c8-9f9b-0155420b315d (project gururmm) — still open, records the now-disproven hypothesis; do not close until onsite verification.
• Served macOS binary: https://rmm.azcomputerguru.com/install/GREEN-FALCON-7214/download/macos (3,960,397 bytes, arm64, ad-hoc signed, id gururmm_agent-51a9f25b57c13649).
• macOS install script: https://rmm.azcomputerguru.com/install/GREEN-FALCON-7214/macos.
• Source files: projects/msp-tools/guru-rmm/server/src/api/enroll.rs (site_id: Uuid), agent/src/config.rs (default_config_path, no macOS branch), agent/src/macos_storage.rs (reads /usr/local/etc/gururmm/site.plist), agent/src/main.rs (resolve_windows_config macOS branch; macOS install stub), agent/scripts/install.sh, agent/pkg-scripts/postinstall (hardcoded d008c7d4-...).
• Prior session: clients/rednour/session-logs/2026-06/2026-06-25-howard-nick-smb-share-and-mac-rmm.md.
• Wiki: wiki/clients/rednour.md (macOS-unsigned known issue — to be corrected post-verify).
• RMM agent (REDNOURCARRIEVI): 8e4e2221-7e2a-4a6f-9eda-864568539961.