Under Ubuntu 10.4
It seems some files under ~/.dbus are set to owner root, which causes problems when starting an X application over SSH.
chowning -R ~/.dbus to user seems to fix the problem.
Under Windows 7
PuTTY often crashes when forwarding an X application. Could this be related?
“This paper demonstrates how to encapsulate any TCP-based protocol (SMTP, POP3, NNTP, telnet…) into HTTP”
Punching holes into firewalls
or “Why firewalls shouldn’t be considered a ultimate weapon for network security”
or “Secure TCP-into-HTTP tunnelling guide”