[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.