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Home » Kerio User Forums » Kerio Connect » Active Directory Auth seems not to work (Authentication against Active Directory with diffrent domain name does not work.)

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We have installed our First Kerio Connect 9.2.x (first customer project to see if this product fits customers need in daily business) on Windows Server 2012R2
But after all reading (connect manual, forum topics, howto about user mapping, googling) authentication for AD imported users does not work.

Windows AD Domain is dowa.local.
Kerio is installed to serve the mail domain
I configured AD Directory Service as in screenshot 1.
Test Connection to AD is successful.
But logon is not possible. In Security I only get the following error: External authentication service rejected due to invalid password for authentication restriction.

Authenticated bind with an external LDAP tool and this user worked without problems (AD username: user<_at_>ad-domain as well as DN CN=username,OU=Users,DC=...)

Something seems to be wrong with Kerio connect, since it seems that I could exclude all other sources of error.

Is there a possibilit to increase the debug level of Kerio to see what it really sends to AD?

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Brian (GFI/Kerio)

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Make sure that in the Advanced tab you have defined your Kerberos realm (should match your AD domain name).
Kerio Connect takes the user's credentials and attempts to authenticate against the DC. This means that the system where Kerio Connect resides needs to have permission to authenticate on behalf of those users.
For more logging you can right click inside the debug log window and choose messages. Enable the 'user authentication' option.

Brian Carmichael
Instructional Content Architect

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Thanks for Your Answer.

I tried this with the AD Kerberos realm already, sadley, it didn't help in the first time.
After many other tries, I tried to restart Kerio Connect after made this setting.

It turns out, Kerio seems to need restarted after "Domain Join" in order to get it work.
Should be written in the manual.
It works now.

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