Here is the full adcheck output:
$ sudo ./adcheck-rhel5-x86_64 ad.goldblattsystems.com OSCHK : Verify that this is a supported OS : Pass PATCH : Linux patch check : Pass PERL : Verify perl is present and is a good version : Pass SAMBA : Inspecting Samba installation : Pass SPACECHK : Check if there is enough disk space in /var /usr /tmp : Pass HOSTNAME : Verify hostname setting : Pass NSHOSTS : Check hosts line in /etc/nsswitch.conf : Pass DNSPROBE : Probe DNS server 192.168.6.1 : Pass DNSPROBE : Probe DNS server 192.168.6.6 : Pass DNSCHECK : Analyze basic health of DNS servers : Pass WHATSSH : Is this an SSH that Centrify DirectControl Agent works well with: Pass SSH : SSHD version and configuration : Warning : You are running OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017. : : This version of OpenSSH does not seem to be configured for PAM, : ChallengeResponse and Kerberos/GSSAPI support. : To get Active Directory users to successfully login, : you need to configure your OpenSSH with the following options: : (display the ones we identified were not set) : ChallengeResponseAuthentication yes : UsePAM Yes : : Centrify provides a version of OpenSSH that's configured properly : to allow AD users to login and provides Kerberos GSSAPI support. DOMNAME : Check that the domain name is reasonable : Pass ADDC : Find domain controllers in DNS : Pass ADDNS : DNS lookup of DC hubcap.ad.goldblattsystems.com : Pass ADPORT : Port scan of DC hubcap.ad.goldblattsystems.com 192.168.6.10 : Warning : One or more ports failed to respond correctly. Either: : a) the DC with this IP address is offline : b) a firewall is preventing access to a port : The following is a list of failed ports: : ntp(123)/udp - timeout ADDC : Check Domain Controllers : Pass ADDNS : DNS lookup of DC hubcap.ad.goldblattsystems.com : Pass GCPORT : Port scan of GC hubcap.ad.goldblattsystems.com 192.168.6.10 : Pass ADGC : Check Global Catalog servers : Pass DCUP : Check for operational DCs in ad.goldblattsystems.com : Failed : No working domain controllers were found. 1 serious issue was encountered during check. This must be fixed before proceeding 2 warnings were encountered during check. We recommend checking these before proceeding
I am aware of the DNS warning; that is because of our transition environment.