I seem to have narrowed the problem down to OfficeScan Common Client Solution Framework (TmCCSF.exe). With that service disabled, curl consistently runs fine. As soon as I start that service, I immediately see the problem. I have to disable it and then reboot once this service has been started. (Presumably the service has some sort of protection that doesn’t allow it to be stopped once it has been started.) I have three other Trend services running that don’t seem to cause problems – OfficeScan NT RealTime Scan, Trend Micro Unauthorized Change Prevention Service, and OfficeScan NT Listener. The weird thing is that I’m pretty sure that I’ve had OfficeScan Common Client Solution Framework running before with no problems, even with the versions of Cygwin and curl that I currently have installed. I also have a coworker with slightly older versions of Cygwin and curl installed and with the OfficeScan Common Client Solution Framework service running who isn’t having any problems with curl. What’s unique about my environment is anybody’s guess. Not sure yet what I’ll do about the gap in AV protection on my machine with that service disabled, but I’m at least glad to have narrowed this probably down. I guess I’m considering this case closed unless anyone has any additional parting thoughts. Thanks again to Ray and Bill for the help in tracking this problem down.

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