Interactive Error Code Quick Reference Guide
Edit ArticleLookup table of all Sentinel agent error codes with instant technician fixes.
Sentinel Operations Team
5 min read
Updated August 28, 2026
v3.2Use this quick reference table to diagnose any error code reported in the Sentinel Management Console or local agent log files.
| Error Code | Name | Category | Severity | Immediate Technician Action |
|---|---|---|---|---|
| AGENT-1001 | Server Unreachable / Heartbeat Timeout | Connectivity | High | Test port 443 and verify base_url in sentinel-agent.toml. |
| AGENT-1002 | Device Token Authentication Rejected | Authentication | Critical | Delete registration.dat and restart service to re-enroll. |
| AGENT-1003 | Local SQLite Queue Database Locked | Storage | Medium | Add C:\ProgramData\Sentinel to antivirus scan exclusions. |
| AGENT-1004 | Windows Service Permission Denied | Installation | High | Relaunch PowerShell as Administrator and run agent-service.exe install. |
| AGENT-1005 | Process Throttling / High CPU Guard | Performance | Medium | Adjust polling interval and remove recursive root folder watch rules. |
| AGENT-1006 | SSL/TLS Certificate Chain Failure | Security / TLS | High | Resync Windows clock (w32tm /resync) or import proxy root CA. |
| AGENT-1007 | USB Monitoring Driver Not Loaded | Hardware | Low | Verify Windows WMI service is running and restart Sentinel service. |
| AGENT-1008 | Browser History SQLite Lock | Browsers | Low | Verify user temp folder write permissions and restart agent service. |
Tags:#Error Codes#Reference#AGENT-1001#AGENT-1007
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