Running 64-bit Linux client 5.9.11 on 64-bit Ubuntu 7.04 system, connecting to the net via a proxy. When trying to attach to the Worldcommunitygrid project, my system logs an error:
Sun May 27 20:45:22 2007||[http_debug] [ID#32] info: SSLv2, Client hello (1):
Sun May 27 20:45:22 2007||[http_debug] [ID#32] info: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
Sun May 27 20:45:22 2007||[http_debug] [ID#32] info: Expire cleared
Sun May 27 20:45:22 2007||[http_debug] [ID#32] info: Closing connection #0
Sun May 27 20:45:22 2007||[http_debug] HTTP error: SSL connect error
Someone more familiar with HTTPS suggested that the error might have something to do with how the SSL version is being specified (i.e., by the boinc client).
Anyway, I was able to successfully attach (through the same proxy) to the WCG project on a (different) system running the 32-bit Linux client 5.10.0. That says to me that my WCG account, and my proxy, are working properly -- leaving the 64-bit client as the probable cause of my HTTPS connect problem.