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I just moved to Ubuntu on my MacBook and I spent the whole day trying to open port 51413 for Transmission.

What I've already done:

  1. I have ufw but I opened ports there and tried without it - probably not the problem:

     51413/tcp                  ALLOW       Anywhere
     51413/tcp                  ALLOW       Anywhere (v6)
    
     21/tcp                     ALLOW OUT   Anywhere
     80                         ALLOW OUT   Anywhere
     143                        ALLOW OUT   Anywhere
     2049                       ALLOW OUT   Anywhere
     110                        ALLOW OUT   Anywhere
     135,139,445/tcp            ALLOW OUT   Anywhere
     137,138/udp                ALLOW OUT   Anywhere
     25/tcp                     ALLOW OUT   Anywhere
     631                        ALLOW OUT   Anywhere
     443/tcp                    ALLOW OUT   Anywhere
     53/udp                     ALLOW OUT   Anywhere
     123/udp                    ALLOW OUT   Anywhere
     993/tcp                    ALLOW OUT   Anywhere
     465/tcp                    ALLOW OUT   Anywhere
     51413/tcp                  ALLOW OUT   Anywhere
    
  2. Router is Pirelli DRG A125G; tried disabling firewall, forwarding ports according to portforward.com but I have no experience with such thing so I don't know if I succeeded. On Transmission, it still shows the port is blocked and nothing is downloading.

  3. CanYouSeeMe.org: Tried to use it to see if ports are open but it shows that port is blocked

  4. Also tried qBittorrent, it also doesn't work.

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  • 2
    You need to allow 51413 on udp too. More importantly what is your transmission configuration ?. You could try opening the wrong port. Also there is a port testing tool in transmission settings. No need to use an external one. If you allowed IGD/UPnP on your routeur, transmission should automatically take care of port fowarding, if you have enabled it. So again what is your transmission settings...
    – solsTiCe
    Jul 21, 2015 at 14:28

1 Answer 1

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It could very well be your ISP blocking it. Try a different port, and see if you can find any info on the web about your ISP restricting incoming traffic or BitTorrent traffic.

When troubleshooting ufw, you should just disable it temporarily to ensure it's not the problem.

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  • it seems that my isp is not blocking the port and i have also tried deluge with port range 6881:6891 no success, i have no idea where is my ports blocked... the other computer on network is imac and it works just fine with utorrent...
    – user94159
    Oct 2, 2012 at 23:12
  • 2
    It's probably port forwarding then. The iMac may work automatically by communicating with the router using UPnP to forward the port, but your Ubuntu machine might not being doing this correctly. Double-check your port forwarding.
    – nfirvine
    Oct 9, 2012 at 16:53
  • I wasnt able to forward the ports but managed using DMZ host to disable it for my ip and it worked :)
    – user94159
    Oct 10, 2012 at 19:52
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    so now your PC is in DMZ... consider to return ufw to enable, default deny all, limit in 51413. If you have problem using ufw, gufw is its simple GUI.
    – feligiotti
    Oct 6, 2014 at 21:25

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