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IMAP authentication failing

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Joined: 3 months ago
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Repost from the Install & Setup subforum:


Hello everyone, 


None of my accounts can authenticate via IMAP to the Carbonio CE server. Imap is enabled on the account, cos, and server levels. I tested the connection using Microsoft Remote Connectivity Analyzer and ran to a weird issue. I got a message saying that no cleartext logins are allowed, but the connection was made using SSL on port 993.


Error message:

C: 2 LOGIN ******** S: 2 NO cleartext logins disabled

Exception details: Message: The IMAP server responded with an error status "2 NO cleartext logins disabled". Type: Microsoft.M365.RCA.Services.Protocols.Imap.ImapServerErrorException Stack trace: at Microsoft.M365.RCA.Services.Protocols.Imap.ImapCommand`1.CheckForOk(IList`1 response) at Microsoft.M365.RCA.Services.Protocols.Imap.LoginCommand.ProcessResponse(IList`1 response) at Microsoft.M365.RCA.Services.Protocols.ProtocolClient.<SendCommandAsync>d__17`1.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.M365.RCA.ConnectivityTests.ImapPop.BaseProtocolTest.<PerformTestInternalAsync>d__12.MoveNex


If I set zimbraImapCleartextLoginEnabled on the server level to TRUE, authentication works. 


Shouldn't this setting not affect sessions made over TLS? My testing is done over port 993.