Changes between Version 1 and Version 2 of MovedToGitHub/PortClosed

Jan 16, 2009, 5:07:20 PM (13 years ago)



  • MovedToGitHub/PortClosed

    v1 v2  
    11= Why is my port closed? =
    34== Description ==
    4 Transmission needs an open port to communicate. You can open one manually or let transmission try to aquire one using NAT PMP or UPnP. Here's how to find out if it worked:
     5Transmission needs an open port to communicate. You can open one manually or let transmission try to aquire one using NAT PMP or UPnP. If both automatic port mapping and manual forwarding failed
    67== Open ports & forwarding ==
    8 ==== NAT-PMP / UPnP ====
    9 If you have an Apple Airport, or a UPnP compatible router, Transmission can map its port automatically. Most routers manufactured since 2001 have this feature.
    10  * Open Transmission.
    11  * Go to Preferences >> Network >> Ports, and check 'Forward port from router'.
    12  * If Transmission reports that the 'Port is open' then you have successfully port forwarded!
    14 ==== Forward manually through a Router ====
    15 Read the documentation of your Router and/or check the instructions on the following Website: []
    17 The Port you need to forward can be set in Transmission's preferences >> Network >> Ports.
    19 ==== Open your local Firewall ====
    20 To allow Transmission to communicate with the outside, you have to open your local firewall. Please read your OS's documentation on how to open a port on your system.
     8For guide on how to open and forward your Transmission port, read the [PortForwardingGuide Port Forwarding] guide.
    2210== Possible Problems ==
    23  * You get the Message 'Port is closed'/'Port is Stealth' in the 'Ports' section of Transmission's preferences
    24   * Check your OS console (Console.App or dmesg) and look out for Transmission's output regarding UPnP
     11If you get the Message 'Port is closed'/'Port is Stealth' in the 'Ports' section of Transmission's preferences.
    26  * Downloads are slow
    27   * Choose another port
    28   * Check if someone else is using your internet connection
    29   * Limit your uploads
     13=== Port check website is down ===
     14Transmission needs an external site to check wether the port is open. However, if that site is down, Transmission has no way to check wether the port is open or not. If you suspect this is the case, go to [].
     16=== UPnP / NAT-PMP ===
     17For UPnP/NAT-PMP compatible routers, make sure:
     18 * UPnP/NAT-PMP is enabled. Consult your router's documentation for instructions. If your router doesn't support UPnP/NAT-PMP, you will have to forward manually.
     19 * DMZ mode is disabled.
     20 * The port has not already been forwarded manually.
     21Note: NAT-PMP is only for Apple Airport routers.
     23=== Double NAT ===
     24Another possible reason your port remains closed could be because your router is not the only device on the network which needs to be configured.
     26For example, your network might resemble the following: ADSL modem/router --> Netgear Router --> Laptop.
     28If you have multiple routers in your home network (such as in the example above), you have two options. The easiest way is to turn one of the routers into 'Bridge mode' which means you then only have to configure one device rather than all of them. So, in our above example, we would set the Netgear router to 'Bridge'. See your router's help documentation for instructions.
     30The second way is to map Transmission's port on all of the devices on your network. Transmission can only automatically port map the router the computer is directly connected to. Any others in between this router and your modem will have to be forwarded manually. For detailed instructions, visit [].
     32Finally make sure your firewall is either disabled, or you have allowed Transmission's port. The firewall can cause the port to remain closed, even if it has been successfully mapped by the router(s).
     34=== ISP Blocking Port ===
     35Though initially this was done to "combat viruses and spam", it is sometimes used to keep out "bandwidth hogs". Normally the default (51413) port is fine. However, it might be that an ISP does decide to block that port. In such a case it is recommended to pick a random number between 49152 and 65535. If you can't find a port that's open (check with []), you have a different issue.
     37=== LAN ISP ===
     38eg. Universities, Wifi hotspots, RV parks and some 'true' ISPs (common in Rome, Italy).
     40Though these ISPs are often very interesting, offering high speeds, unlimited bandwidth (sometimes) and low prizes. This because they don't buy IP adresses for their clients and provide the (local) network themselves.
     42Basically the only thing you can do, is to ''politely'' ask for them to open (forward) a port for you.
    3245== Comments ==
    33 >jah: shouldn't this page just read 'consult T's help file'? All the info here has either been directly copy/pasted from the help file, or slightly modified but not materially better. I see no reason to have duplication.
    34 >>theCrank: Well, maybe it's a good idea to let this Page evolve a bit and replace the help file?
    35 >>>jah: why? isn't one of the 'guidelines' on the wiki front page to avoid duplication? frankly, there isn't much (if anything) that could be added here on this topic.
    36 >>>>theCrank: In the help files there are no examples which help to identify the problem (like log snipplets, ...). We can use the wiki to describe the most common problems (and their symptoms?) more detailed and maybe stop some users in the forums to post the same questions over and over again.
    37 >>Waldorf: Let's look at it differently: This is, by far, the most asked question. And, apparently, most of the ppl screaming for help either didn't read the help or ''think'' they did, but didn't. So, if, because of this page here, ppl can resolve their issues (even if it's just forwarding to the build-in help), I think it's worth it.