OpenVPN v2.0.7 (server mode) works fine now on winXP-SP2.
However, OpenVPN v2.1b13 (server) reports "TLS negotiation failure" on the same set of keys|certs where v2.0.7 works fine.
I see the servers certificate arriving (on the client) and then the session stops for 60 seconds. After that - "TLS failure" and re-try...
Summary: client(v2.1b13)<->server(2.0.7) = OK client(v2.1b13)<->server(2.1b13) = NOK Tony.