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A few people have reported seeing the following assertion failure:
Assertion failed! Program: C:\Program Files\Putty\putty.exe File: tree234.c Line: 536 Expression: relation == REL234_LT || relation == REL234_GT
Appears to be dependent on use of port forwarding. Also, "It was working fine until a few days ago", "funnily enough this started happening in the last couple of weeks", so may be something to do with a Windows hotfix or update. One report indicates that it happens on WinXP but not Win2000; another report is against WinME.
As far as we can tell this implies that WinSock is sending us unexpected
messages. As of 2002-12-09, diagnostics have been added of the form
"Strange WinSock message: wp=00000000 lp=00000002"; the numbers will
help us to debug the problem. Further info from an original reporter
I have noticed that the lp=1 correlates to the rule for port 3000 and lp=2 correlates to the rule for port 110.
SGT: Reported as fixed in 2003-01-10. (The diagnostics confirmed that WinSock was occasionally sending netevent messages with wParam==0, hence relevant to no socket. If the lParam had contained an error notification for an error which wasn't socket-specific, I might have believed they were meaningful and paid them some attention; but the lParam was actually an ordinary FD_READ/FD_WRITE sort of thing which makes no sense on a non-socket. So I've just put in code to ignore such messages, and that seems to have worked.)
Audit trail for this semi-bug.