Connected to <хост>.Escape character is '^]'.The telnet utility (in Windows, Linux, Mac OS) is used to check if remote service (e.g., Cargador or PostgreSQL) is accessible over network.
Windows Vista/7 does not include telnet by default. In order to install telnet, go to Control Panel / Programs / Get Programs, and put the check mark across the telnet client option in the Turn Windows Features On and Off section. The installation takes less than 3 minutes.
Connection check is basically an attempt to connect to a specified TCP port (pair “host:port”). The command line looks like this:
telnet <хост> <порт>
, where <port> may have a following value:
- 45430 – to connect to Cargador within LAN;
- 45431 – to connect to Cargador from Internet;
- 4080 – to connect to Cargador by HTTP protocol;
- 5432 – to connect to PostgreSQL service.
If connection attempt is successful, then you’ll see the following:
- Telnet in Windows clears the console screen;
- Telnet in MacOS and Linux displays the following text:
Connected to <хост>.
Escape character is '^]'.
Press Ctrl+] (right bracket) and type quit to exit telnet.
If the connection attempt failed, the case needs further research. Possible causes:
- Host unavailable. Use ping command to check it.
- Network port is blocked by firewall.
- Service (e.g., Cargador) is not running on the server.