DNS Failing through VPN WAN

[toluun]

Hello,

I am having an interesting problem that just started last evening. I can't resolve any non-local addresses using the DNS resolver(unbound) ONLY if I set the outgoing network to my Mullvad VPN. It appears that all my requests timeout. If I then set my outgoing network on unbound to my typical WAN I have no issues. It does appear that unbound is caching properly, however any non cached addresses fail on the VPN WAN.

I am really inexperienced with DNS and therefore am having trouble deciphering unbound's logs. What kind of things can I do to troubleshoot this issue? What should I look for in the logs to differentiate between a failed and successful DNS request? Any help is greatly appreciated.

[toluun]

I think I may have narrowed it down a little as it does not appear to be an issue withe the actual VPN service. If I use DIG on a root server.

dig @a.root-servers.net cnn.com 

I get a valid response.

However, if I use unbound at its local address

dig @192.168.20.1 cnn.com

I get a SERVFAIL response. Any thoughts?