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  1. #1
    Junior Member ftibbitts is on a distinguished road
    Join Date
    Feb 2018

    Router DNS relay not accepting TCP port 53 traffic

    Model :

    Hardware Version :

    Firmware Version :

    ISP : [/COLOR]

    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:
    1: flags=82<CONNECTED,PREFERRED>
    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

  2. #2
    It's better to report this issue to tp-link support directly. I don't think they will take care of the forum


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