SSH in debian/ubuntu safe login

SSH in debian/ubuntu safe login

'' Changing the port sshd listens on is a simple process and some times is needed to prevent hacking.. it's just a matter of updating your sshd_config file and then reloading the new configuration.

Use the procedure below to change the port that sshd is listening on to for example 21000 :

Warning: Incorrectly following this procedure may render your server unreachable through SSH.
1. From your terminal session, edit /etc/ssh/sshd_config

2. Look for the following line:

#Port 22

3. Change the line so it looks like this:

Port 21000

4. Save and close the file

5. Load the new configuration by using the service command

/etc/init.d/sshd restart

Note: you may immediately lose connectivity to your server on the open ssh session you are currently running.

6. Test the connection

$ ssh [Only registered and activated users can see links. Click Here To Register...] -p 21000

If you're using PuTTy on Windows, you can specify the port number in the profile for you connection and then re-save the profile using the new port.

Also you can specify who can login via ssh port ...
Just edit this line :
AllowUsers xxxxx ...so only user xxxxx can login with ssh to your pc..

For more safety you can prevent root login to ssh...Just edit this line as:
PermitRootLogin no

So now you login as user and after with a su command you are the root..

At last you can edit the time you have for writing the password with this line:
LoginGraceTime 45 ... don't prefere much time...I think after this you made a small step to login to your server with the safest way... ''