Version: (using KDE KDE 3.5.7) File transfer used to work. Boiko and I tested it, now it doesn't - even with properly configured NAT.
Comment from the Kopete site: "While the file itself is transfered, sandsmark kopete crashed while it finished the filetransfer from his jabber account to mine. Not really sure if this is a jabber issue or not, see bug below. brot" Could this be related to http://bugs.kde.org/show_bug.cgi?id=162760 ?
Please update to newer version as we don't have manpower to support Kopete in KDE 3. If you still see this bug in new version please reopen this bug report.