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PING and TELNET commands
PING allows you to know whether a machine is accessible via the internet. With this tool you can also check whether you are addressing the right machine, during a DNS change, for example, by looking at the IP address obtained. You can carry out a ping an a domain name, a hostname or an IP address.
TELNET allows you to test the connection to a server irrespective of all the additional rules of a mail client or an FTP client in order to determine the source of a problem. If the connection does not work on an SMTP server, you will need to check for example whether your firewall is blocking port 587.
Under Mac OS X
- search for Network utility
- Go to the Ping tab, Lookup or Traceroute depending on what you want to test
- You can also use Terminal and follow the directions below
Under Windows (enable Telnet first if necessary)
- openRun and enter cmd
- In the window which opens, depending on what you want to test, enter:
telnet [server[ [port]
Replace [server] with the server name or its IP address; do the same for [port]
- use the application Simple Telnet Client for free, which allows you to very simply test via 2 fields to be completed (via mail.infomaniak.com and the port 143).
However, if you mainly want to check that your site is correctly online (using scripts which would like to ping the hosting at regular intervals for example) then you need to use another method (click here).