So I've had an Exchange Server (v2013 with cu21) running on a Windows Server 2012 R2 box for several years now, without many problems.
We almost exclusively use Outlook-Exchange integration and active sync.
Recently, I have a need to use IMAP on a particular client, but it doesn't seem to work. I thought I've had IMAP enabled since the original install, and everything I check seems to support that, yet I simply can't connect using IMAP.
Things I've tried:
- IMAP4 service and IMAP4 Backend service are both running, automatically. I tried restarting both services.
- Connecting via a local LAN, so external firewall shouldn't be an issue.
- Verifying ports 143 and 993 are open. They are. Tried disabling the Windows firewall just for good measure. Nothing.
- I'm using a wildcard SSL certificate works fine for other purposes. I used
Get-IMAPSettingsto check that the certificate was properly defined, and I used
Set-IMAPSettings -X509CertificateNameto set it again just to be sure.
- I've checked
Get-ServerHealthto make sure all IMAP-related processes are
- I downloaded a script called
HealthChecker.ps1and ran that just for good measure.
Test-IMAPConnectivityfails with the very helpful status of
- I can telnet to 578 (smtp) from another machine on the LAN, but when I telnet to 143 or 993, I get a black terminal (like the entire terminal window resets) and then after about 5 seconds it sends me back to the command prompt, with no messages.
- I tried
Set-ImapSettings -ProtocolLogEnabled $true, but my login attempts don't even appear in the log. The only user I see accessing IMAP in the logs is the Health mailbox.
Set-IMAPSettins -ExternalConnectionSettingjust for fun
- Verified that IMAP is enabled in ECP for the user that I'm using to test
What could I be missing here?