Modify the SSH remote logon port in Linux

In Linux, modify SSH remote logon port 1, and set the SSH remote logon port to 1211 # vi/etc/ssh/sshd_configPort1211 # Replace & amp; rsquo; # Port22 & amp; rsquo; change to & amp; rsquo; Port1211 & amp; rsquo; # AddressFamilyany # ListenAdd... in Linux, modify the SSH remote logon Port 1 and the SSH remote logon Port 1211 # vi/etc/ssh/sshd_config Port 1211 # Change '# Port 22' to 'port 1211 '; # AddressFamilyany # ListenAddress0.0.0.0 # ListenAddress: # servicesshd restart # restart the SSH service Add a whitelist to les # iptables-I INPUT-p tcp -- dport 2201-j ACCEPT # service iptables save the first command takes effect immediately, but it will become invalid after restart, therefore, you need to save the command to the iptables configuration file. path:/etc/sysconfig/iptables. 3. add a user with normal permissions and set the password in security enhancement: # useradd xiaozui # Disable ROOT remote logon on the passwd woiit.net server: # vi/etc/ssh/sshd_config # LoginGraceTime2m # PermitRootLoginno # change 'permitrootloginyes' to 'permitrootlogin no' # Region # MaxAuthTries6 # MaxSessions10 # servicesshd re Start # Restart the SSH service. remote management uses xiaozui, a common user, to log on. Then, use suroot to switch to the root user and obtain the highest permission.