certificate mismatch error in owa on exchange 2007

[bayusoye]

I am having issues with my owa and would want your professional assistance in resolving the issues.
We are running exchange server 2007 and a mixture of outlook 2003 and 2007. A local CA was created and certificate was assigned to ISA 2006 listener with FQDN owa.externaldomainname.com which reflect in the MX record of our external hosted domain and another one was issued to the mail server as servername.localdomainname.com on the default website. When accessing owa using https://owa.externaldomainname.com it would display “mismatch error indicating that The security certificate presented by this website was issued for a different website's address. Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server”. After several attempt to restart either exchange server or ISA would later allow the owa page to display without the error. The big problem is that owa on my network has become very unstable and my users are seriously disgusted about its intermittent service.
What can I do to improve and make my owa to be available at all time?
It is also worthy to know that we switch on and off our servers everyday and this problems starts every morning and subsequently too.

[EINSTEIN_007]

Did you search for similar type of issue: Certificate error accessing "Outlook Web Access" on SBS 2003
http://forums.techarena.in/small-bus...ver/770757.htm
Outlook web access
http://forums.techarena.in/small-bus...ver/821002.htm

[Viceman]

The following links fixed the issue for me.

http://www.windowsitpro.com/Articles...5865.html?Ad=1

http://technet.microsoft.com/en-us/l.../aa995942.aspx

Another way to get around this issue is to make the certificate name eg, mail.company.com, resolve to the internal IP address of the exchange 2007 server.

Eg,
Externally: mail.company.com resolves to external IP address

Internally: mail.company.com resolves to the internal IP address of the exchange 2007 server.

Cheers