IMAP inaccessible on Exchange Server 2013

If you are experiencing an issue where the IMAP clients are not able to connect on the Exchange Server 2013/2016 server, and when trying to telnet the 143/993 port the connection drops automatically, then this Tutorial may shed some light on your issue.   The error message when trying to test IMAP connectivity is listed below.

Microsoft.Exchange.Monitoring.ProtocolException: Authentication failed. The connection is being closed.

Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.Server response while making connection:[]

Read more at source: http://itprocentral.com/imap-inaccessible-on-exchange-server-2013/

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