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RT-AC86U. Port scan shows port 21 open to WAN. FTP has always been off. How do I close it?

Discussion in 'Asuswrt-Merlin' started by markpaterson, Aug 18, 2019.

  1. markpaterson

    markpaterson New Around Here

    Aug 18, 2019
    I'm running Merlin 384.13 on an ASUS RT-AC86U. I installed Merlin yesterday for the first time and did a factory reset after installing.

    I've just done a port scan of my home's external IP from a computer outside of my home network and it revealed that Port 21 is open. I have never used the FTP setting on the router, and I confirmed that it's off and the "allow FTP over WAN" is off too.

    How do I close this port? I see nothing in the entire firmware that even mentions port 21.

  2. ColinTaylor

    ColinTaylor Part of the Furniture

    Mar 31, 2014
    Is it actually open or is it detecting your ISP's equipment and thereby creating a false positive? Try connecting to it from outside your network and see what the banner message says.

    That said, there was this fix for FTP in 384.13:
    384.13 (31-July-2019)
      - FIXED: FTP would be accessible from the WAN even while disabled
               if you had DualWAN load balancing enabled, or IPTV
  3. eastavin

    eastavin Regular Contributor

    Jun 4, 2011
    Niagara Falls, Canada & USA
    Try another scan with Gibson shields up for comparision https://www.grc.com/x/ne.dll?bh0bkyd2