Why can't I pull changes from the git repository from another terminal program?

Question

git

And so, with the help of the default terminal, I can push / pull, but with the help of iterm I can’t, writes that

ssh: Could not resolve hostname github.com: nodename nor servname provided, or not known fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.

What to do?