Bug 1649 documented that AllowTCPForwarding is false on Solaris 10, which will cause ThinLinc to fail. When we get more Solaris customers, or if this becomes the default on some other large platform, we should let tl-setup check this setting and warn or correct it if it's wrong.
Not a problem on a prioritised distribution so we'll push this forward.
This hasn't happened in practice on Linux systems. Closing.