Mail won't go online with IMAP but Exchange works

Mac mail has beeen working fine for me for many years. Last day or so all my non Exhcange accounts won't go online. I read through the forum. I have checked the connection doctor. It is "unable to contact server". I tried network utility to port scan the IMAPS port. That worked just fine. I do have a software firewall called Little Snitch. I checked all the rules in there. There are no block rules for mac Mail. I also dissabled the the firewall with no results. I was hoping to get my primary gmail account working. So I removed it and re-added it. No luck.
I think this problem may be related to SSL certificates. At work we have a firewall that does SSL termination. It has a self signed certificate on it. I have often gotten mismatched SSL warnings when picking up mail. I can't seem to find the SSL certificates anywhere on the mac so I don't know where to delete them. Removing and re-adding the gmail account should have refreshed the SSL certificate. So thism may not be the issue.
Any suggestions would really help.

Rebooting the Mac fixed the problem. I have no idea why. Still unable to locate the mail ssl certificates.

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Rebooting the Mac fixed the problem. I have no idea why. Still unable to locate the mail ssl certificates.

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Mail won't go online with IMAP but Exchange works

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