Error when connecting to directory service

[sahans]

Hi friends i have an error when connecting to the Free nas to the AD,
DNS setting are correctly setup but didnt connect to the AD

 

[anodos]

That error is being returned by the underlying system kerberos library. It indicates that attempts to connect to a KDC in your realm were unsuccessful. Perhaps it's an issue with DNS / SRV records. Perhaps it's a firewall issue.