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Suppressing the Security Alert from Outlook client

How do I suppress the Security Alert from popping up in outlook which indicates an Exchange Server as the cause of the alert .  Here is my environment setup.  We have an AD infrastructure of Parent - Child domains.  Our Exchange org is based on 2 child domains one domain in New York and the other domain in Virginia. We are moving from Exchange to Google gmail.  Currently most of our users are on gmail but some are still on exchange but will be migrated later in the year. Meanwhile they are getting the Security alert from outlook that the "Exchange Server(Virginia)" "The security certificate has expired or is not yet valid".  This is coming from the Virginia Exchange server which all the users are on gmail and no longer using exchange but we still have some users in the Exchange server in New York.  Instead of having the IT group in Virginia renewal the ssl to get rid of this Alert is it possible to suppress this Alert from the Outlook client 2010/2013.
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Scott C
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Hi Hbpub,

What I can suggest is, If you already have your Enterprise Certificate Authority, generate and replace the expired SSL Certificate with new Internal Certificate. However, make sure the users are accessing the outlook from Domain joined workstations, other wise all non-domain machine must have your Enterprise CA Chain present in Trusted Certificate Authority Store to avoid non-trusted Certificate pop-ups.

Secondly, As you said users are only in New York site server, as a work around what you can do is, use the same (New York) certificate on both CAS location Server and change the namespace in Virginia CAS.

Aanand Singh Karki
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Had the IT group in Virginia renew the SSL and that cleared it.