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Exchange 2013 CU11 - unable to connect to IMAP

Unable to connect to IMAP, i see in Security log that authentication fails, doesnt seem to send proper username and password through.

LOG:
Logon Type:			3

Account For Which Logon Failed:
	Security ID:		NULL SID
	Account Name:		
	Account Domain:		

Failure Information:
	Failure Reason:		Unknown user name or bad password.
	Status:			0xC000006D
	Sub Status:		0xC0000064

Process Information:
	Caller Process ID:	0x19c
	Caller Process Name:	C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\PopImap\Microsoft.Exchange.Imap4.exe

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i have verfied IMAP is started and active.
i have verified that account Im trying has IMAP enabled.
I have tried both Basic and Secure, same thing.
able to telnet to 143 and 993 from remote machine.


Just doesnt seem to pass proper username and password.


Thanks for any suggestions!
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itmti
Asked:
itmti
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1 Solution
 
Jian An LimSolutions ArchitectCommented:
Use Basic
restart the service, and change the username format to DOMAIN/USERNAME
or remove the doman and use USERNAME
also try USERPRINCIPALNAME
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itmtiAuthor Commented:
tried all, no luck.
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Jian An LimSolutions ArchitectCommented:
you need to now setup the connectivity logging to find out what happen

https://technet.microsoft.com/en-us/library/aa997690(v=exchg.150).aspx

I will also use a 3rd party like thunderbird to try this to work out what happen on the password.
https://support.microsoft.com/en-us/kb/189326
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Jian An LimSolutions ArchitectCommented:
Also, i hope you have enable both IMAP services
Microsoft Exchange IMAP4 and Microsoft Exchange IMAP4 backend
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itmtiAuthor Commented:
Hi Jian An Lim,

These are the only Microsoft exchange services we have on CAS server

screenshot
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Jian An LimSolutions ArchitectCommented:
Go to your mailbox server and check for the services Microsoft Exchange IMAP4 backend

READ
https://technet.microsoft.com/en-us/library/bb124489(v=exchg.150).aspx
1
 
itmtiAuthor Commented:
Thanks worked like a charm!
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