to check for all open ports on a server netstat is the tool of choice and here are some common options:
netstat -na show all open ports without dns resolving for speed
netstat -tlnup show all open ports and the associated programm using this port
to check for all open ports on a server netstat is the tool of choice and here are some common options:
netstat -na show all open ports without dns resolving for speed
netstat -tlnup show all open ports and the associated programm using this port