[regression] Cannot run more than one instance of transmission-gtk or transmission-daemon on the same machine at the same time

[Tristan Schmelcher]

DESCRIPTION
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Starting in Oneiric, it is not possible to run more than one Transmission process (e.g., transmission-gtk or transmission-daemon) on the same machine at the same time in the default configuration. In the default configuration, the peer-port setting is fixed at 51413, and only the first transmission process is able to use it. Any other transmission processes started after that--e.g. by another user--are non-functional because they are unable to use that same port. Worse, there is no error message of any kind (either in the GUI or on stderr) informing the user that this is the problem. Downloads simply never start.

In my case, I have two user accounts that both use transmission-gtk and I also run one instance of transmission-daemon for downloading torrents when I'm not logged-in. The transmission-daemon is started first at system boot and thus works, whereas the two user accounts are both unable to use transmission-gtk.

WORKAROUND
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By enabling the "Pick a random port" option in Edit -> Preferences -> Network.

RELEVANT DETAILS
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- This is a regression. In Natty transmission was somehow able to recover from this situation automatically. I often used transmission-daemon and transmission-gtk simultaneously without problems.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: transmission-gtk 2.33-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sat Jan 14 11:45:14 2012
ExecutablePath: /usr/bin/transmission-gtk
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
SourcePackage: transmission
UpgradeStatus: Upgraded to oneiric on 2011-11-13 (62 days ago)
XsessionErrors:
 (gnome-settings-daemon:5091): GLib-CRITICAL **: g_variant_get_int32: assertion `g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
 (check-new-release-gtk:5731): Gtk-WARNING **: Unknown property: GtkMessageDialog.has-separator

[Tristan Schmelcher (tschmelcher)]

Also repros in Precise, package version 2.42-1ubuntu1.