Can't access server via RDC through one of the LAN port among two.

Hello!!
I have a window 2008 server with two LAN port. First with public IP Address and Second with Private IP for internal connection (no gateway IP Address). I'm able to connect server via RDC via public IP but not via Private IP. 
Pls suggest how can I troubleshoot for dual connectivity through RDC.
Regards,
nts007

I have seen this issue with multihomed systems.  I would verify connectivity from the client first.
1. Can you Ping the private IP from the client?
If the pings are unsuccessful...
Are your client and server IP on the same subnet
I have run into this problem on multihomed servers.  Because the default gateway points to a router on the public IP, return traffic from the server might be being sent to the default gateway.  
To solve this you will need to use the route add command to tell the server to send the return traffic to a router through the private IP.
2. If you could ping the IP, I would make sure you can reach the RDP port on the internal IP
From a command prompt can you make a connection to the rdp port (3389 by default)?
telnet privateip 3389
If you can you will get a screen with the cursor at the top right if you can't it will say "Could not open connection"
If you could not connect to the port, then check to see if the Windows firewall might be preventing the connection.   
3.  If that doesn't work then I'd follow Milo's advice and use Netmon.  You might have to run it from the client and the server to get a full understanding of the issue.

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