MSM765zl Controller Active Directory Problem

[Wißgott]

Hi,

we had a problem with our new MSM765zl Controller. When i configure a Device Name and Windows Domain under "Authentication" -> "Active Directory" the Status changed to Not Joined.
Thats ok because i haven't joined the realm yet.
When i SHH to the Controller and look at the active directory setting with "show active-directory" in config mode i get this:
-------------------------------------------
Active Directory
----------------
Device NetBios name: msm765zl
Windows Domain: domain.bla

Check LDAP attribute for access? No LDAP attribute to check: MsNPAllowDialin

Join status: Not joined

Last error: Cannot resolve network address for KDC in requested realm

AD server name: DC1.domainname.bla
IP address: 192.168.1.1
-------------------------------------------

What this error Message mean?

Thanks...

[Wißgott]

Software Version: 5.4.1.0-01-9131

DNS Lookup of the Controller Name works fine with name and IP