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Apparently, if working in a terminal session at the moment a tunnel is opened, there is a chance of causing a crash (either `Out of memory!', or `Windows has closed PuTTY due to errors').
This tends to be noticeable when lots of port-forwarded connections are being opened and closed (tunnelling HTTP or POP/SMTP for example).
All reports so far that have mentioned the protocol version have been against SSH-2, with local-to-remote tunnelling. There are suggestions that this is correlated specifically with user input rather than just any terminal activity.
Update: We believe this is fixed. I (JTN) can consistently reproduce the problem in 2002-06-05 but not 2002-06-18 (or 2002-08-19).
Audit trail for this bug.