Troubleshooting Common Issues in Total Network Inventory Deployments
1. Discovery fails or misses devices
- Likely causes: incorrect credentials, firewall/port blocking, SNMP/WMI disabled, wrong IP range/subnet.
- Fixes: verify credentials (WMI/WinRM for Windows, SNMP community for network devices), open required ports (TCP 135, 445, WinRM ports; SNMP UDP 161), enable and configure SNMP/WMI/WinRM on targets, confirm correct scanning ranges and network segmentation, add device exceptions for VLANs or subnets.
2. Incomplete or incorrect hardware/software data
- Likely causes: outdated agents, limited permissions, unsupported device types, OS reporting restrictions.
- Fixes: install or update the inventory agent where available, grant read-level admin rights for WMI/WinRM, update device SNMP MIBs if needed, ensure latest TNI version to support new OS/hardware, use alternate discovery methods (agentless vs agent-based) to cross-check.
3. Slow inventory scans or high network load
- Likely causes: aggressive scan concurrency, large IP ranges scanned without filters, scanning during peak hours.
- Fixes: reduce concurrent threads, schedule scans during off-peak hours, narrow discovery ranges, exclude known offline IPs, enable bandwidth-friendly options in settings, use distributed scanning if supported.
4. Authentication errors
- Likely causes: expired/locked accounts, wrong domain formatting, policies blocking remote auth (UAC, restricted firewall).
- Fixes: verify account status and password, use DOMAIN\username or username@domain format as required, enable remote UAC exceptions or configure LocalAccountTokenFilterPolicy for local accounts, ensure target machines allow remote management.
5. Agent installation or update failures
- Likely causes: endpoint security blocking installers, group policy conflicts, network connectivity issues.
- Fixes: whitelist installer in AV/endpoint protection, deploy via GPO or remote management tool, check MSI/log output for errors, ensure ports and share access for installation files.
6. License or activation problems
- Likely causes: license limit exceeded, incorrect license file, time/date mismatches.
- Fixes: verify license capacity and assigned agents/devices, reapply license file or re-activate through vendor portal, ensure server/system time is correct.
7. Reporting discrepancies or export failures
- Likely causes: corrupted database, mismatched schema after upgrade, permissions on export paths.
- Fixes: run database integrity checks, follow upgrade migration steps from vendor, grant write permissions to export folders, export smaller datasets to isolate problem.
8. UI or server crashes
- Likely causes: insufficient resources, corrupted cache, incompatible plugins/extensions.
- Fixes: increase server RAM/CPU, clear application cache/logs, review logs for errors, disable third-party integrations and re-enable one-by-one, update to latest stable release.
9. Inability to scan cloud or remote networks
- Likely causes: missing VPN/connector, NAT/port translation, lack of credentials for cloud APIs.
- Fixes: deploy remote scanners/connectors in target network, configure VPN or site-to-site connectivity, use cloud API credentials where supported (AWS/Azure), open required ports and configure NAT traversal.
10. Unexpected device duplication
- Likely causes: multiple discovery methods picking same device, IP changes/DHCP churn, hostname resolution conflicts.
- Fixes: enable device deduplication settings, prefer stable identifiers (MAC, serial number, UUID) for matching, adjust discovery rules to avoid overlaps, synchronize with DHCP/CMDB to track dynamic IPs.
Quick troubleshooting checklist
- Confirm network connectivity and required ports.
- Verify credentials and permissions.
- Check TNI version and update agents.
- Review logs (server and agent) for errors.
- Reduce concurrency and reschedule heavy scans.
- Validate license and disk/database health.
If you want, I can produce step-by-step commands for checking WMI/WinRM/SNMP, or a diagnosis script tailored to Windows/Linux agents.