ATL SOAP & IIS & SSL Got Connection Reset by Peer

I have a XML webservice on IIS 5.1 with self-issued certificate.
My ActiveX tryes to invoke a webservice method using class
CSecureEvtSyncSocket from msdn sample
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsam.../html/v
Invoking webmethod over regular HTTP it works fine, but over HTTPS i receive
error 10054 (Connection reset by peer) during response body read. IIS logs
say that request is OK (200) but immidiately after this there was a 400 or
500 error.
ActiveX is using multithreading model.