Hi Mark, Make sure you are using SSL to SSL bridging. While you don't have to include the CA cert on the client, you should becasue you'll avoid that error dialog box and you'll get quicker log on performance. HTH, Tom Thomas W Shinder www.isaserver.org/shinder ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp -----Original Message----- From: Mark Hippenstiel [mailto:M.Hippenstiel@xxxxxxxxxxxx] Sent: Saturday, September 13, 2003 11:41 AM To: [ISAserver.org Discussion List] Subject: [isalist] RE: OWA problem http://www.ISAserver.org Hi Tom, no, only the certificate is not considered valid because the CA cert is not installed on the client machine. Does it need to be installed then? I thought clicking on 'yes' in the certificate waring box would suffice.. So momentarily it's just plain OWA over SSL. Mark