Sporadic DNS Issue with multiple users over SSL-VPN
We have a lingering DNS problem that has persisted through version upgrades. Occasionally we are getting DNS queries sent to the internet instead of the internal DNS servers while connected to SSL VPN using the watchguard client. Because our internet domain matches our internal domain these resolve and are stuck until we run ipconfig /flushdns We've been using this workaround for years it doesn't come up in any reliable pattern.
This is on machines which we've adjusted the automatic metric on and those we haven't. I'm assuming our DNS servers didn't reply quick enough or a packet gets dropped here or there and it eventually falls over to one of the other adapters settings.
Any ideas on how we can resolve/mitigate the issue or what the cause may be?