Model :

Hardware Version :

Firmware Version :


Model : Archer C9

Hardware Version : v1

Firmware Version : 3.17.0 Build 20150514 Rel.70681n

ISP : Comcast

The router DNS relay does not appear to accept traffic on TCP port 53. UDP traffic is fine. A DNS query that requires TCP (due to response size) fails with a connection refused error. I don't see any settings in the router that will fix this.

$ dig <host>
;; Truncated, retrying in TCP mode.
;; Connection to for <host> failed: connection refused.

$ nc -uv 53
found 0 associations
found 1 connections:
outif (null)
src port 56688
dst port 53
rank info not available

Connection to port 53 [udp/domain] succeeded!

$ nc -v 53
nc: connectx to port 53 (tcp) failed: Connection refused