Exchange Autodiscovery not working on Xenapp Servers

Recently our Exchange certificates expired and so we replaced them. Since then our Autodiscovery for all our Xenapp servers seems to have stopped working. It works for all of our non Citrix PCs.

I can ping our CAS server and it works fine manually but when I try to create an account through auto discovery it fails with the error could not validate user name or server. Can anyone help?
MSSC_supportAsked:
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Gareth GudgerCommented:
If you open up the URL for Outlook Web App on your XenApp servers, does it show a certificate error? I am wondering if your root/intermediary certs changes and the servers do not recognize them.

Also, confirm the XenApp servers are using the correct DNS servers. If you ping autodiscover on the XenApp and on a working PC, does it resolve to the same IP?
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MSSC_supportAuthor Commented:
I do not get any certificate errors at all. Also, the Xenapp Servers all use the correct DNS servers. Our DNS is configured to use the certificate web address and resolve it to our CAS server.

I cannot ping autodiscover as it is not in DNS. When I run the autodiscover test in outlook, it works and passes successfully from our fat clients but not from the XENAPP servers.
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MSSC_supportAuthor Commented:
Also pinging the certificate address resolves correctly to the CAS server.
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MSSC_supportAuthor Commented:
I ran these and it looks like it has worked.

support.microsoft.com/kb/940726
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MSSC_supportAuthor Commented:
The article has resolved my issue.
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