PostgreSQL Connection Loss After Upgrade on CIS-Hardened Ubuntu

Overview

MetaDefender Core may lose PostgreSQL connectivity following an upgrade on Ubuntu systems with CIS (Center for Internet Security) hardening enabled.

Symptoms

  • Web Console becomes inaccessible after completing a MetaDefender Core upgrade

  • Error page displayed when attempting to access the Web Console


  • The following error appears in the application logs:

[ERROR ] 2025.08.14 03:20:11.504: (core.postgres) Postgres issue, error='Starting postgres service failed', param='Warning: Tt file, source configuration file or drop-ins of ometascan-pg.service changed on disk. Run 'systemctl daemon-reload' to reload. ' [msgid: 4084]

Root Cause

This issue appears to be related to a systemctl behavior when CIS hardening is applied to the system. The exact cause is currently under investigation.

Solution

Restart the MetaDefender Core service:

# Use systemctl systemctl restart ometascan # Or use service service ometascan restart

Additional Notes

  • This issue is specific to CIS-hardened Ubuntu environments

  • The service restart resolves the connectivity issue immediately

  • No data loss or configuration changes are required


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PostgreSQL Connection Loss After Upgrade on CIS-Hardened UbuntuOverviewSymptomsRoot CauseSolutionAdditional Notes