Got error while checking LDAP and RPC connectivity. Please check your firewall settings

Hi,

I have single Domain Controller 30 machines are not able to contact the Server then possibly i checked internet in the Directory Server i was not able to browse Internet though Directory Server. Then i ran dcdiag /fix, I got the following errors. I have checked the network interface too but still i am unable to resolve the issue.

Other Machines connected to the Directory Server are getting internet.

Other Errors from the NETLOGON Service : Event 5722

The session setup from the computer WS-15 failed to authenticate. The name(s) of the account(s) referenced in the security database is WS-15$.  The following error occurred: Access is denied.

DistributedCOM : Event 10016

The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID
{D63B10C5-BB46-4990-A94F-E40B9D520160}
 and APPID
{9CA88EE3-ACB7-47C8-AFC4-AB702511C276}
 to the user NT AUTHORITY\SYSTEM SID (S-1-5-18) from address LocalHost (Using LRPC) running in the application container Unavailable SID (Unavailable). This security permission can be modified using the Component Services administrative tool.

C:\Windows\system32>dcdiag /fix

Directory Server Diagnosis

Performing initial setup:
   Trying to find home server...
   Home Server = ADServer2
   * Identified AD Forest.
   Done gathering initial info.

Doing initial required tests

   Testing server: Default-First-Site-Name\ADSERVER2
      Starting test: Connectivity
         The host a5062caf-4ee7-400f-a70d-9e4d8e84e0f0._msdcs.ad.xxxx.com could not be resolved to an IP address. Check the DNS server, DHCP, server name,
         etc.
         Got error while checking LDAP and RPC connectivity. Please check your firewall settings.
         ......................... ADSERVER2 failed test Connectivity

Doing primary tests

   Testing server: Default-First-Site-Name\ADSERVER2
      Skipping all tests, because server ADSERVER2 is not responding to directory service requests.


   Running partition tests on : ForestDnsZones
      Starting test: CheckSDRefDom
         ......................... ForestDnsZones passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ......................... ForestDnsZones passed test CrossRefValidation

   Running partition tests on : DomainDnsZones
      Starting test: CheckSDRefDom
         ......................... DomainDnsZones passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ......................... DomainDnsZones passed test CrossRefValidation

   Running partition tests on : Schema
      Starting test: CheckSDRefDom
         ......................... Schema passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ......................... Schema passed test CrossRefValidation

   Running partition tests on : Configuration
      Starting test: CheckSDRefDom
         ......................... Configuration passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ......................... Configuration passed test CrossRefValidation

   Running partition tests on : ad
      Starting test: CheckSDRefDom
         ......................... ad passed test CheckSDRefDom
      Starting test: CrossRefValidation
         ......................... ad passed test CrossRefValidation

   Running enterprise tests on : ad.vinformax.com
      Starting test: LocatorCheck
         ......................... ad.xxxx.com passed test LocatorCheck
      Starting test: Intersite
         ......................... ad.xxxx.com passed test Intersite

Kindly help me to sort out the issue.

Regards,

D.Nithyananthan.

Thanks & Regards, D.Nithyananthan.