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:
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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:

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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