[Guide] Client Port Blocked by Firewall

Last Updated: Sep 26, 2017 06:56PM CEST

Diagnosing Connection to a Client node through a Firewall

Case:

The client is blocked by a firewall.

 
If the client port is blocked by a firewall, a DOS window containing a command and the results is briefly displayed after the ping utility is run:
 
Command: netstat –ano | findstr SYN
Results: TCP | 172.16.10.65:57963 | 172.16.0.180:32334 | SYN_SENT | 2904
 
TCP
Protocol
 
172.16.10.65:57963  
Sender port (Sender ID)
 
172.16.0.180:32334  
Client port (Receive ID)
 
SYN_SENT
TCP status
SYN_SENT is the typical indicator for the existence of a firewall on the client side blocking the client port.
2904
Start ID for the connection to the client.
 
 

Resolution

 
Open Ports 32325 to 32335, to and from, the client and server nodes.
 
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