I have used a registry fix to work on an IMAP issue of one of my client. The following error message I have found when I use Microsoft Remote Connectivity Analyzer

The certificate couldn’t be validated because SSL negotiation wasn’t successful

The fix:

Go to the following registry settings:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v15\ServerComponentStates\ImapProxy Functional

Change the existing value from 1:0:635797425487970123



Restart the IMAP windows services and you are done !


1 Comment

  1. awpross

    After 20 hours of Problems, I found this Post, which helped me. I think the behaviour of IMAP and POP3 with Wildcard certificates have changed. This is why my Server, which I upgraded from a previous Version was working, and the new installed Servers had that Problem with wildcard certificate.
    Thank you very much.


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