Can't connect a remote server using ssh

How remote?

Is the remote server behind a firewall?

Is the remote server behind a home router?

Are you inside a corporate environment and have a corporate firewall that does not allow direct ssh connections outside the company network?

Do you have an anti-virus package installed on the remote server?

Do you have an anti-virus package installed on your Mac?

Can you

ping address.of.remote.server

Have to tried using

ssh -v addr.of.remote.svr

ssh -v -v addr.of.remote.svr

ssh -v -v -v addr.of.remote.svr

Then compare the output from the -v options against an ssh connection that works. Generally the -v output from a working ssh connection and a failed ssh connection will track very closely until the failed ssh terminates early, and in that area is where you can generally figure out why you are having ssh connection issues.