What does 'failed to resolve IP address' mean?

The first thing that happens when using any of the tools is that the entered hostname has to be converted to the IP address. This happens using the configured DNS server. If this fails, you get the "failed to resolve IP address" message.

Typically this happens when:
  1. You lose the Internet connection so the DNS server cannot be queried for the IP address.
  2. You mistype the domain name and type something that doesn't exist - e.g. "google.comm" which then cannot be converted to an IP address. Note you also get this error when you mistype the IP address, e.g. 192.168.01 (missing dot).

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