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Volker Hohmann wrote: > As AV I use Norton-AV not NOD32. > > In between I loaded the sources of cvsnt (Version 2.5.01.1976), to make > some tracing of the problem. > > I see the following steps: > > cvs connects to cvsservice (via 2401). cvsservice accepts the connect. > (If I implement a recv, cvsservice can receive the data from cvs). > cvsservice create a new cvs process. The open_osfhandle of this process > fails. > If I set the inherit property in cvsservice (with SetHandleInformation), > open_osfhandle returns no error, but a read from the socket handle > returns "invalid handle". > > Is that what you mean with "breaks TCP/IP stack" ? > Yes. This is guaranteed to work per. MSDN specs, and is required for certain types of application to work (including CVSNT). Anything that breaks that is just plain broken. Norton works OK so that's not the issue. Have you looked at cvsdiag or run WinsockXPFix? Tony