What port should Kara block to prevent administrative connections to the server?

Blocking port 22 is an effective measure to prevent administrative connections to a server because this port is primarily used for SSH (Secure Shell), which is a protocol for secure remote administration of systems. SSH allows administrators to securely connect to a server over the network to manage the system, execute commands, and transfer files securely. By blocking this port, Kara would effectively eliminate the primary means by which unauthorized users might attempt to gain remote administrative access to the server.

The other ports mentioned serve different purposes: port 80 is used for HTTP traffic, port 443 is associated with HTTPS for secure web traffic, and port 1433 is typically used by Microsoft SQL Server for database connections. Since none of these ports are specifically intended for administrative control like port 22 is, blocking port 22 is the most effective strategy for restricting administrative access.