A server I'm working on has blocked all unknown addresses from accessing port 22 (via a firewall). An IP address has to be added to the firewall first via a control panel (or command line) before it can access port 22.
Is that a really good security measure? Are there ways that port 22 can still be hacked/penetrated given this measure? It's a really inconvenient measure (my IP changes almost on daily basis and I will have to update it). I still have access to that control panel to be able to add my IP, is that a weak point?
How effective/secure is this measure?