Transmission

I'm running Transmission-Daemon 1.74-1 on a headless Debian Lenny system (but pulled from the testing/Squeeze repo), however it appears to be unreachable from the internet (online port checking services report it is closed) and it is very slow to pick up peers. The web interface and everything else about the daemon appear to be working fine.

A few things:

1. All ports on my router are properly forwarded. I can put other services to listen on the same port and they are reachable.

2. Transmission-daemon appears to be listening on those ports. The output of "netstat -lptu" gives:

tcp 0 0 *:9091 *:* LISTEN 23493/transmission-
tcp 0 0 *:9080 *:* LISTEN 23493/transmission-
tcp6 0 0 [::]:9080 [::]:* LISTEN 23493/transmission-
udp 0 0 *:9080 *:* 23493/transmission-

Which shows it listening on all protocols on port 9080, and also that the web interface is listening on 9091.

I have also tried running rTorrent on the server, and this works just fine - it is reachable behind the same port, and picks up peers very quickly. Additionally, Transmission on my Mac (a separate computer) in the same network is reachable too.

I'm not sure what other diagnostics I can give. If someone wants to fire some packets at the daemon, just resolve insurgent.dnsalias.org and fire at port 9080.

Any help would be much appreciated — I'm trying to move across from rTorrent which has ceased development quite some time ago.

And a port scan from an external server gives the following. Why is the state listed as "filtered"? (Compared to rTorrent's "open" state)

====================================================================================
nmap -A -T4 -vv -p9080 rebel.dnsalias.org

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2009-09-30 22:33 UTC
Machine 118.93.42.13 MIGHT actually be listening on probe port 80
DNS resolution of 1 IPs took 6.50s.
Initiating Connect() Scan against 118-93-42-13.dsl.dyn.ihug.co.nz (118.93.42.13) [1 port] at 22:33
The Connect() Scan took 12.51s to scan 1 total ports.
Host 118-93-42-13.dsl.dyn.ihug.co.nz (118.93.42.13) appears to be up ... good.
Interesting ports on 118-93-42-13.dsl.dyn.ihug.co.nz (118.93.42.13):
PORT STATE SERVICE VERSION
9080/tcp filtered unknown

Nmap finished: 1 IP address (1 host up) scanned in 20.432 seconds
====================================================================================

Compared to rTorrent:

====================================================================================
nmap -A -T4 -vv -p9085 rebel.dnsalias.org

Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2009-09-30 22:31 UTC
Machine 118.93.42.13 MIGHT actually be listening on probe port 80
DNS resolution of 1 IPs took 6.50s.
Initiating Connect() Scan against 118-93-42-13.dsl.dyn.ihug.co.nz (118.93.42.13) [1 port] at 22:31
Discovered open port 9085/tcp on 118.93.42.13
The Connect() Scan took 0.52s to scan 1 total ports.
Initiating service scan against 1 service on 118-93-42-13.dsl.dyn.ihug.co.nz (118.93.42.13) at 22:31
The service scan took 129.89s to scan 1 service on 1 host.
Host 118-93-42-13.dsl.dyn.ihug.co.nz (118.93.42.13) appears to be up ... good.
Interesting ports on 118-93-42-13.dsl.dyn.ihug.co.nz (118.93.42.13):
PORT STATE SERVICE VERSION
9085/tcp open unknown
1 service unrecognized despite returning data.
====================================================================================

Hmm. Ignore this. I don't know what is wrong, but with the exact same setup I moved to port 9090 and became reachable.

I asked for help too soon!