Testing Exchange 2019 / Imap connectivity

FDVA 1 Reputation point

We've enabled the IMAP4 services, and set the External Connection Settings
Confirmed the Exchange Certificate has IMAP enabled

I tried testing the connection from https://testconnectivity.microsoft.com/tests/Imap/input
it shows port 993 is opened, but fails on the certificate

The Microsoft Connectivity Analyzer is probing the TCP endpoint [X.X.X.X ] on port 993 to detect which SSL/TLS protocols and cipher suites are enabled.
We were unable to determine which SSL and TLS protocols are enabled. This is usually because we couldn't connect.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Amit Singh 4,846 Reputation points

    It seems that port 993 was blocked. You can check it in the Windows Firewall(Advanced Security). Besides, make sure the Microsoft Exchange IMAP/IMAPBE services are running, and make sure your certificate is assigned the IMAP service(You could check that by running the command "Get-ExchangeCertificate | fl Subject, Services).

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