Trnamission always claims port is closed despite being open

[Cubytus]

Hi there,

a recurring issue I had with Transmission installed on fvdwsl-base: it always claims the port is closed, despite me opening it in the router. The router runs OpenWRT, but since the result was the same with Gargoyle (a dd-wrt derivative) on another router, I tend to think the issue is rather with fvdwsl-base or Transmission itself.

Any insight?

[Jocko]

Hi

Transmission opens itself the port if a upnp service is enabled on the router.
So if you created a nat rule for it, you have to remove it and let transmission to do it after enabling upnp on your router

[Cubytus]

I never enabled UPnP on any of my routers out of security concerns. In fact, both Gargoyle and OpenWRT (and perhaps dd-wrt) turn off UPnP by default, and on OpenWRT, it isn't even installed.

Why can't Transmssion just use the manually opened port?

[Jocko]

I do not know as we are not the developers...

What I can say it works when I let transmission to forward the port :

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[2022-01-24 16:41:33.765] Port Forwarding (NAT-PMP) initnatpmp succeeded (0) (natpmp.c:73)
[2022-01-24 16:41:33.765] Port Forwarding (NAT-PMP) sendpublicaddressrequest succeeded (2) (natpmp.c:73)
[2022-01-24 16:41:35.748] Port Forwarding (UPnP) Found Internet Gateway Device "http://192.168.1.1:60000/7024abc4/upnp/control/WANIPConn1" (upnp.c:200)
[2022-01-24 16:41:35.749] Port Forwarding (UPnP) Local Address is "192.168.1.99" (upnp.c:201)
[2022-01-24 16:41:36.818] Port Forwarding (UPnP) Port forwarding through "http://192.168.1.1:60000/7024abc4/upnp/control/WANIPConn1", service "urn:schemas-upnp-org:service:WANPPPConnection:1". (local address: 192.168.1.99:59135) (upnp.c:276)
[2022-01-24 16:41:36.819] Port Forwarding (UPnP) Port forwarding successful! (upnp.c:280)
[2022-01-24 16:41:36.819] Port Forwarding Forwarded (port-forwarding.c:107)

But anyhow if you set manually the port (TCP and UDP rules), it is also ok according this page https://transmissionbt.com/help/gtk/1.6x/html/troubleshoot.html

[Cubytus]

Supposed to be OK, but still doesn't work :( I don't have a "double NAT" as described, just a regular cable modem + router. Can't post on their forum either as the register page appears to be cycling through the same fields without acknowledging entries.

On the desktop version of Transmission, I got these parts of the log when switching the port from a forwarded one to a non-forwarded one:

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2022-01-24 18:18:09 +0000 net.c:462 [Debug] Transmission: Bound socket 11 to port 51415 on 0.0.0.0
2022-01-24 18:18:09 +0000 net.c:462 [Debug] Transmission: Bound socket 12 to port 51415 on ::
2022-01-24 18:18:23 +0000 net.c:462 [Debug] Transmission: Bound socket 11 to port 51414 on 0.0.0.0
2022-01-24 18:18:23 +0000 net.c:462 [Debug] Transmission: Bound socket 12 to port 51414 on ::

[Jocko]

To check on the nas, you can do that

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 netstat -apn|grep transmission

and you should get at least these lines

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tcp        0      0 0.0.0.0:55185           0.0.0.0:*               LISTEN      8826/transmission-d
tcp        0      0 0.0.0.0:9091            0.0.0.0:*               LISTEN      8826/transmission-d
tcp        0      0 :::55185                :::*                    LISTEN      8826/transmission-d

udp        0      0 0.0.0.0:55185           0.0.0.0:*                           8826/transmission-d

55185 is my forwarded port.

And to enable the debug log mode, do if you did not change the location where the downloaded files are stored

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killall transmission-daemon
transmission-daemon -g /direct-usb/tr-daemon -w /direct-usb/tr-downloads --log-debug --logfile /var/log/transmission.log


(be careful transmission.log will be verbose)

[Cubytus]

After the first command:

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 # netstat -apn|grep transmission
tcp        0      0 0.0.0.0:9091            0.0.0.0:*               LISTEN      4155/transmission-d
tcp        0      0 0.0.0.0:9093            0.0.0.0:*               LISTEN      4155/transmission-d
tcp        0      0 0.0.0.0:51413           0.0.0.0:*               LISTEN      4171/transmission-d
tcp        0   6771 192.168.1.10:9093       201.160.220.246:14109   ESTABLISHED 4155/transmission-d
tcp        0      1 192.168.1.10:34795      103.244.242.56:30027    SYN_SENT    4155/transmission-d
tcp        0      0 192.168.1.10:49311      86.204.71.225:6881      ESTABLISHED 4155/transmission-d
tcp       32      0 192.168.1.10:46284      172.67.73.71:443        CLOSE_WAIT  4155/transmission-d
tcp        0 243360 192.168.1.10:9093       46.0.56.58:30783        ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:33089      200.8.97.124:6881       ESTABLISHED 4155/transmission-d
tcp        0    425 192.168.1.10:56683      196.206.198.118:6881    ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       188.251.120.65:55088    ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:44120      172.67.73.71:443        ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       99.233.198.37:29168     ESTABLISHED 4155/transmission-d
tcp        0    509 192.168.1.10:60683      197.210.64.127:3204     ESTABLISHED 4155/transmission-d
tcp        1      0 192.168.1.10:46324      195.82.146.120:80       CLOSE_WAIT  4155/transmission-d
tcp        0  56937 192.168.1.10:9093       41.103.19.24:11335      ESTABLISHED 4155/transmission-d
tcp       32      0 192.168.1.10:46766      172.67.74.208:443       CLOSE_WAIT  4155/transmission-d
tcp        0    281 192.168.1.10:9093       105.68.155.198:49828    ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       37.228.200.125:22852    ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       151.246.208.131:58004   ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       154.122.56.157:64603    ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       157.48.76.118:48155     ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       41.82.182.239:62850     ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:46171      90.17.249.103:16881     ESTABLISHED 4155/transmission-d
tcp        0  39032 192.168.1.10:9093       187.32.237.15:1796      ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       213.47.23.51:55381      ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:9093       177.132.53.91:50533     ESTABLISHED 4155/transmission-d
tcp        0      1 192.168.1.10:51351      117.155.170.212:23087   SYN_SENT    4155/transmission-d
tcp        0      1 192.168.1.10:54153      37.172.86.209:35035     SYN_SENT    4155/transmission-d
tcp        0      0 192.168.1.10:9093       51.39.2.16:1225         ESTABLISHED 4155/transmission-d
tcp        0      0 192.168.1.10:36058      172.67.70.124:443       ESTABLISHED 4155/transmission-d
tcp        0      0 :::9093                 :::*                    LISTEN      4155/transmission-d
tcp        0      0 :::51413                :::*                    LISTEN      4171/transmission-d
udp        0      0 0.0.0.0:60975           0.0.0.0:*                           4155/transmission-d
udp        0      0 239.192.152.143:6771    0.0.0.0:*                           4155/transmission-d
udp        0      0 192.168.1.10:48259      192.168.1.1:5351        ESTABLISHED 4171/transmission-d
udp    62464      0 0.0.0.0:9093            0.0.0.0:*                           4155/transmission-d
udp        0      0 0.0.0.0:43218           0.0.0.0:*                           4155/transmission-d
udp        0      0 0.0.0.0:51413           0.0.0.0:*                           4171/transmission-d
udp        0      0 192.168.1.10:59402      192.168.1.1:5351        ESTABLISHED 4155/transmission-d
udp        0      0 0.0.0.0:57619           0.0.0.0:*                           4155/transmission-d
unix  3      [ ]         STREAM     CONNECTED     18745154 4171/transmission-d
unix  3      [ ]         STREAM     CONNECTED     18743761 4155/transmission-d
unix  3      [ ]         STREAM     CONNECTED     18745155 4171/transmission-d
unix  3      [ ]         STREAM     CONNECTED     18743758 4155/transmission-d
unix  3      [ ]         STREAM     CONNECTED     18743760 4155/transmission-d
unix  3      [ ]         STREAM     CONNECTED     18745152 4171/transmission-d
unix  3      [ ]         STREAM     CONNECTED     18743757 4155/transmission-d
unix  3      [ ]         STREAM     CONNECTED     18745151 4171/transmission-d

After killing and restarting in verbose mode:

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# transmission-daemon --log-debug --logfile /share/1000/tr-downloads/transmission_verbose.log

How do I filter out files?

[Jocko]

You can remove all line containing the string resume.c or torrent.c or announcer.c or tr-dht.c.

According with your netstat -apn command, the port is open on your nas. So with a nat rule on your router there is no issue but check also its firewall settings (some router do not create a firewall rule at the same time you set a nat rule)