AD Repication Problem

I have this timimg and Dns issue  issue for AD diagnostic


omain Controller Diagnosis

Performing initial setup:
   * Verifying that the local machine nlpcpfa-dc1, is a DC.
   * Connecting to directory service on server nlpcpfa-dc1.
   * Collecting site info.
   * Identifying all servers.
   * Identifying all NC cross-refs.
   * Found 2 DC(s). Testing 2 of them.
   Done gathering initial info.

Doing initial required tests
   
   Testing server: nlpcpfa\NLPCPFA-DC2
      Starting test: Connectivity
         * Active Directory LDAP Services Check
         [NLPCPFA-DC2] LDAP bind failed with error 8341,
         A directory service error has occurred..
         The clock difference between the home server NLPCPFA-DC1 and target

         server NLPCPFA-DC2 is greater than one minute. This may cause Kerberos

         authentication failures. Please check that the time service is working

         properly. You may need to resynchonize the time between these servers.

         ......................... NLPCPFA-DC2 failed test Connectivity
   
   Testing server: nlpcpfa\NLPCPFA-DC1
      Starting test: Connectivity
         * Active Directory LDAP Services Check
         * Active Directory RPC Services Check
         ......................... NLPCPFA-DC1 passed test Connectivity


AND Also
Summary of DNS test results:
         
                                            Auth Basc Forw Del  Dyn  RReg Ext  
               ________________________________________________________________
            Domain: nlpcpfa.com
               nlpcpfa-dc2                  PASS FAIL n/a  n/a  n/a  n/a  n/a  
               nlpcpfa-dc1                  PASS PASS FAIL PASS PASS PASS n/a