I have an issue where a set of Email Mailboxes periodically (daily) lose connection with Exchange with the following errors:
HelpSpot Error Log:
Cannot connect to [email address] #IMAP Errors-> Kerberos error: Unknown code krb5 195 (try running kinit) for [Exchange server];Retrying PLAIN authentication after AUTHENTICATE failed.;Retrying PLAIN authentication after A tasks.php 171
Which coincides with the Exchange message:
The number of simultaneous connections made by user [email address] has exceeded the limit (16).
Is there a chance that either HelpSpot or Exchange are holding onto connections longer than needed or some other configuration setting that I am missing? The odd part is that there are only 3-4 Email Mailboxes that lose connections out of around 20, and it is always the same ones yet I cannot see how they are configured differently at either end.
Any help would be greatly appreciated!
I should note: Swapping connections from using POP3:110 & IMAP:143 and visa versa generally restores the connection for the next 24 hours or so but this is a cumbersome daily chore.