[tdrgabi]

In my experience, each time a firewall is blocking a connection, you experience it as a timeout, so the app tries to connect and finally times out.

Which would take longer. I haven't tried though

[happymellon]

It depends entirely on how the firewall is set up.

If you are getting timeouts then the folks who set up the firewall hate you.

[iforgotpassword]

No, it usually results in an immediate connection refused.

[tsukurimashou]

it won't wait for a timeout if the connection is explicitly dropped by a blocking rule