How to check the network connection between two computers?

In cases where Splashtop On-Prem app fails to connect to a target Streamer, the first thing we should check is whether the network connection is blocked between:

  1. Splashtop On-Prem app and Splashtop Gateway
  2. Splashtop On-Prem app and Splashtop Streamer
  3. Splashtop Streamer and Splashtop Gateway

If Splashtop Gateway is deployed in cloud, we should also check the connection between Splashtop On-Prem app/Streamer and Splashtop Gateway/Relay/Database servers.

We can simply use the Ping and Telnet command to check the network connection between two computers/servers.

Testing Network connection

Ping: You can test if a network connection exists by pinging the other computer.

  • Open a command prompt
    • Type “ping IP_of_Target_Computer” and press enter.

Telnet: You should also test the connection using telnet as this allows you to specify the TCP port.

  • Open a command prompt
  • Type in "telnet IP_of_Target_Computer PORT" and press enter.
    • For example, we would type “telnet 443
  • If a blank screen appears then the port is open, and the test is successful.
  • If you receive a connecting... message or an error message then something is blocking that port.  It could be the Windows firewall, a third party firewall like Norton's or a hardware firewall between the PCs.

What a successful test will tell you:

  • If you can both ping and telnet to the other computer, this shows that there is a network connection and the port is open between the two computers.

What to do if you had problems during this test:

  • Verify the computers are physically connected to the network.
  • Check whether there is a firewall between the two computers.
  • Use IP address instead of hostname because hostname may not be resolved.
  • Some domains block telnet and ping as a security measure, and this test will not work in all cases.
2 out of 4 found this helpful