I know what you mean. I however meant somethign different.

Port 5050 and Xfer 80 are the right settings for Yahoo Messenger on Maemo. However the problem is after signing out these settings get lost/messed up. If you want to sign in again (say you lost wifi connection and then it gets in range of a wifi connection again) Yahoo cannot sign in because the Port and Xfer numbers are wrong. Then you ahve to manually set them again to 5050 for the Port and for tje Xfer to 80. After having done that Yahoo signs in again without any problem.

So somewhere within the Yahoo Messenger plugin for Conversations on Maemo there is something going wrong, which screws up the port numbers.......