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There is a problem with the proxy server's security certificate. The security certificate is not from a trusted certifying authority.
Outlook is unable to connect to the proxy server mail.company.com. (Error Code 18)
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Our domain controller shutdown unexpectedly last night, and ever since then all users on the floor are getting the above error message.
If I go into certmgr.msc and navigate to Trusted Root Certification Authorities I can see the Exchange certification listed and still valid. Under certification path it states that the certificate is OK.
It appears as though the certification is not being pushed out to the users. What would cause this, even with a valid cert on the server? Am I able to manually push it out to the users?