IMAP issue: The certificate couldn’t be validated because SSL negotiation wasn’t successful
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
to
1:1:635797425487970123
Restart the IMAP windows services and you are done !
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.
Thank you very much!
Same problem with a new wildcard.
After hours of searching I found your post and could fix it.
Did the following:
Set-ImapSettings -ExternalConnectionSettings “mail.XXXXX.XX:993:SSL”,”mail.XXXXX.XX:143:TLS” -X509CertificateName mail.XXXXX.XX
Change the Reg. Value (1:0:63… to 1:1:63…)
Restart-Service MSExchangeIMAP4; Restart-Service MSExchangeIMAP4BE
Good to hear that !
Very recent post, after the April 2019 updates on my Exchange 2013 bent this setting.
Hope, the post helped you !