How to Troubleshoot Linux Servers That Cannot Resolve Names After VPN Changes

VPN clients and servers can install resolver settings or routes that override expected DNS behavior.

Checks to make

Compare resolver configuration and routes before and after VPN connection, test internal and public names, and inspect split-DNS policies. Confirm the intended resolver is reachable and avoid hard-coding public DNS where internal names require private resolution.

When to get help

Linux administration can diagnose resolver and VPN interactions. Informatix Systems can assess the symptoms, evidence, and next steps. Contact Informatix Systems to discuss this issue.