CHAPTER 8 How to Fix The Web: Obscure Back-End Techniques and Terminal Secrets
panel or SSH, your options are very limited. There’s a slim chance that an
overenthusiastic firewall is getting in the way, or that you’re experiencing
a denial of service attack. Or else you’ll need to contact your hosting
company and ask for help.fiRewallS
Firewalls are bits of hardware or software that filter incoming and
outgoing data. These filters are applied according to the source and
destination IP address and port. So, for example, a firewall should allow all
requests going to the server’s port 80 or else nobody will be able to get to
the website. But it may block all requests to port 8443 (Plesk), port 22 (SSH)
or port 3389 (remote desktop) except from a few known and trusted IP
addresses.Using PuTTY for SSH from a Windows computer.