cannot resolve any name

[norbi771]

I already commented https://forum.netgate.com/topic/162839/internal-dns-server-not-working describing my problem, but as issue becomes hot I decided to describe my problem again as separate topic:

my setup is

PFSense Netgate XG-7100 
2.4.4-RELEASE-p3 (amd64)
built on Thu May 16 06:01:19 EDT 2019
FreeBSD 11.2-RELEASE-p10

My PFSense box is unable to resolve any address (I think it may be related to a power outage).
I disabled forwarder and resolver, just to stay on /etc/resolv.conf but my pfsense box is still unable to reach any named address. Computers in LAN (if 8.8.8.8 as dns server is given) can resolve addresses properly.

root: dig google.com +trace

; <<>> DiG 9.12.2-P1 <<>> google.com +trace
;; global options: +cmd
;; connection timed out; no servers could be reached

root: dig @8.8.8.8 google.com +trace

; <<>> DiG 9.12.2-P1 <<>> @8.8.8.8 google.com +trace
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached

I checked whatever is possible, and it doesn't seem I have anything configured improperly on the firewall side.

One note, I have 2 interfaces:

1. WAN - just public IP
2. DMZ - static route to the corporate network via a separate router

This setup was working fine and suddenly users reported problems with DNS.
I thought in the beginning that it is dns forwarder issue, but then I realized that my PFSense is unable to resolve any addresses.

The router is hundreds of miles away from me so I have to do whatever is possible remotely.
Can somebody give me some advice, please?

[norbi771]

Apparently, another corporate router CISCO ASA connected to DMZ was the troublemaker. After physical disconnect and reboot of that device, everything started to work fine again :-)