We have exchange server 2007 with Outlook 2007 as Outlook client. On two users computers we are getting following security error intermittently.Information you exchange with this site can not be viewed or changed by others. However, there is a problem with the site's security certificate. It gives cross on The name on the security certificate is invalid or does not match the name of the site.This problem was initially coming on all the computers when you start Outlook. I have sorted out by folloeing the link - http://support.microsoft.com/?kbid=940726 Now this error is coming on two computers only. Kindly help.NzmNzm

Tell us more about the certificate you installed. What type? Is it a SAN certificate? How did you request it?Here's a good place to start learning about this subject--it's not trivial.http://technet.microsoft.com/en-us/library/bb851505.aspx

It affects only 2 computers? Run the Test E-mail AutoConfiguration tool in Outlook 2007 - press CTRL and right-click the Outlook icon in the System tray. (Uncheck the Guesssmart stuff).Does it find the same URLS as the workstations that work?

Hi,Whether the two computers are connected Exchange server by using RPC not HTTPS? Additionally, please post the result of your testing by click Test-Email AutoConfiguration.ThanksAllen