Are you trying to join a server to the domain via a vpn connection?
See this if so:  http://forums.techarena.in/active-directory/900728.htm

Troubleshooting Endpoint map issues
http://support.microsoft.com/kb/839880

Also, check this solution:  https://www.experts-exchange.com/questions/23250478/Getting-There-are-no-more-endpoints-available-from-the-endpoint-mapper-when-trying-to-join-a-Win-2003-server-to-a-domain.html

Hi,
I checked all the mentined link but No issue are there.
I found the error "NetpSetDnsHostNameAndSpn: NetpGetComputerObjectDn failed: 0x6d9" in the %systemroot%\debug\Netsetup.Log file so pls assit me accordingly.

For your more reference I am attaching the whole error.

8/21 14:17:17 NetpDoDomainJoin
08/21 14:17:17 NetpMachineValidToJoin: 'GISPAPEDT1'
08/21 14:17:17 NetpGetLsaPrimaryDomain: status: 0x0
08/21 14:17:17 NetpMachineValidToJoin: status: 0x0
08/21 14:17:17 NetpJoinDomain
08/21 14:17:17       Machine: GISPAPEDT1
08/21 14:17:17       Domain: itinfra.com
08/21 14:17:17       MachineAccountOU: (NULL)
08/21 14:17:17       Account: itinfra.com\admin
08/21 14:17:17       Options: 0x27
08/21 14:17:17       OS Version: 5.2
08/21 14:17:17       Build number: 3790
08/21 14:17:17       ServicePack: Service Pack 2
08/21 14:17:17 NetpValidateName: checking to see if 'itinfra.com' is valid as type 3 name
08/21 14:17:17 NetpCheckDomainNameIsValid [ Exists ] for 'itinfra.com' returned 0x0
08/21 14:17:17 NetpValidateName: name 'itinfra.com' is valid for type 3
08/21 14:17:17 NetpDsGetDcName: trying to find DC in domain 'itinfra.com', flags: 0x1020
08/21 14:17:20 NetpDsGetDcName: failed to find a DC having account 'GISPAPEDT1$': 0x525
08/21 14:17:20 NetpDsGetDcName: found DC '\\ADCServer.ITINFRA.COM' in the specified domain
08/21 14:17:22 NetpJoinDomain: status of connecting to dc '\\ADCServer.ITINFRA.COM': 0x0
08/21 14:17:22 NetpGetLsaPrimaryDomain: status: 0x0
08/21 14:17:22 NetpGetDnsHostName: Read NV Hostname: GISPAPEDT1
08/21 14:17:22 NetpGetDnsHostName: PrimaryDnsSuffix defaulted to DNS domain name: ITINFRA.COM
08/21 14:17:22 NetpLsaOpenSecret: status: 0xc0000034
08/21 14:17:22 NetpGetLsaPrimaryDomain: status: 0x0
08/21 14:17:22 NetpLsaOpenSecret: status: 0xc0000034
08/21 14:17:22 NetpJoinDomain: status of creating account: 0x0
08/21 14:18:07 NetpGetComputerObjectDn: Unable to bind to DS on '\\ADCServer.ITINFRA.COM': 0x6d9
08/21 14:18:07 NetpSetDnsHostNameAndSpn: NetpGetComputerObjectDn failed: 0x6d9
08/21 14:18:07 ldap_unbind status: 0x0
08/21 14:18:07 NetpJoinDomain: status of setting DnsHostName and SPN: 0x6d9
08/21 14:18:07 NetpJoinDomain: initiaing a rollback due to earlier errors
08/21 14:18:07 NetpGetLsaPrimaryDomain: status: 0x0
08/21 14:18:08 NetpManageMachineAccountWithSid: status of disabling account 'GISPAPEDT1$' on '\\ADCServer.ITINFRA.COM': 0x0
08/21 14:18:08 NetpJoinDomain: rollback: status of deleting computer account: 0x0
08/21 14:18:08 NetpLsaOpenSecret: status: 0x0
08/21 14:18:10 NetpJoinDomain: rollback: status of deleting secret: 0x0
08/21 14:18:10 NetpJoinDomain: status of disconnecting from '\\ADCServer.ITINFRA.COM': 0x0
08/21 14:18:10 NetpDoDomainJoin: status: 0x6d9

If this is connecting across a firewall, you also need a small group of dynamic ports open say in the 5000 range.  The rest of the ports you have open are good as long as both TCP and UDP are open.  Download this white paper that describes how to connect remote servers to DCs separated by a firewall.

http://www.microsoft.com/downloads/details.aspx?familyid=C2EF3846-43F0-4CAF-9767-A9166368434E&displaylang=en

Appendix E gives a registry key to add.

All the required ports are open (bi direction) between the source and destination. My other servers(same network) had added in the domain but only this computer is not add in the domain.
I mentioned the error in my previous comments so pls check and provide the solution according.

Find the attached error snapshot file.

endpoint-error.JPG

Have you tried to join to your domain any other computer (PC or server) at this remote site after experiencing the above problem?  If you have been successful with others, then it clearly points to a problem with the server listed above as you indicate you have verified all necessary ports are open.

If this is the only problem PC, are there any messages in the Event Viewer regarding this failure?

I will try to add the server from its physical local instead of doing it from RDP. Will get back to you after checking the same.

Cheers !

Please leave this question open as the OP is doing additional checking.

Not happening from other server as well. There is a firewall between Domain and server which i wanted to add into domain. If possible please let me know the list of ports which i can request to firewall team and get those port open for adding server into domain.

Thanks !

After opening any port (from client to server) from firewall server is added to domain. I need to know what ports used between Domain and member server to add the server into specific domain.

Please respond to my Query !

I am not much clear on that above post. Can you please mentioned all ports.

Please close it.

Hello Everyone , If you Wnat to slove this problem make thouse tests
1. connect from XP mashine using VPN connection from  telnet %your DC IP% on port 1025 or 1024 and 53
2. try the same task in local network
if 1025 / 1024 port connection fails and 53 port connection succueeds on VPN it means you have router device port problem .
if it does the same on local network you have to configure the ipsec tool using microsoft ipsec tool
http://support.microsoft.com/kb/908472
hope it will help.