I'm root on a machine I don't know how it was configured.
I try to open SSHD on another port than 22 but it does not work.
I changed the /etc/ssh/sshd_config file and added a new Port line extra to the Port 22.
but it does only work when this second port is a number above 1024. Why is that? How can I find the reason?
I'm restarting it using /etc/init.d/sshd restart as root.
"netstat -apn" does not show the port is open by any other service (anyway I tried different ports and only above 1024 work).
"telnet localhost port" also shows the service works only when they are above 1024.
In iptables all tables are empty.