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