I've just built a new server that's running PHP 8.1.5 and the latest version of OSTicket. We also recently updated our Exchange Server to 2019. I am unable to setup email fetching for a local mailbox on the server because we are using a wildcard certificate and I cannot setup IMAP or POP without getting another certificate (we've already tried the workaround to get IMAP and POP working with the wildcard cert with no success). So I was thinking I could use an O365 mailbox instead. When I setup everything in the OSTicket admin panel the "Sending email via SMTP" portion works without a hitch, however I cannot set up "Fetching Email via IMAP or POP" no matter which option I choose. I've followed all the videos, read any and all posts I can find pertaining to this error and none of the options are working. I should be able to use IMAP or POP through O365 right? Is there a reason it would need to go through our Exchange server? I'm almost at my wits end with this one. 😅

The error is: TLS/SSL failure for outlook.office365.com: Unexpected TCP input disconnect

    IvanAllhiser

    Please read the requirements before installing. 1.16.x requires PHP 8.0. Downgrade your PHP to 8.0, install all the extensions listed in admin panel > information tab, and make sure php-imap extension is installed. You may also want to ensure you have the appropriate OpenSSL version installed on your server. You may also want to test imap connection from the server to ensure it’s possible.

    If you are getting TCP disconnect it might be a firewall issue, or something of the sorts. Contact your server/network admin to ensure the port is open on the server and nothing is blocking the connection.

    If all else fails you can contact your mail provider.

    Cheers.

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