Mary,
I've generated my own self-signed certificates with keytool to see what
happens (instead of using those provided). I've got the same error.
I've forgotten to tell you that I also have another error in the event
viewer at the same time than the url error :
Event ID: 259
An incoming identity could not be validated. The identity of the site
could not be validated. Contact the administrator of the site. For more
information, see the event log.
Inner Exception: The X.509 certificate is both not chain trusted and peer
trusted. Chain trust error(s): The X.509 certificate CN=W20129, OU=test,
O=test, L=test, S=test, C=fr; B032AE17C7A84AF563548E6F9D9AE88D28D3D3B
chain building failed. The certificate that was used has a trust chain
that cannot be verified. Unknown error. Peer trust error(s): The X.509
certificate CN=W20129, OU=test, O=test, L=test, S=test, C=fr;
B032AE17C7A84AF563548E6F9D9AE88D28D3D3B is not in the trusted people store.