How to change these ports ?

logged in as root type

nano /etc/ssh/sshd_config

Thats your SSHD config file. On that there will be line called
Port 22

We need to change that. You can change the number 22 to whatever port that you like. after you done hit Ctrl+O key on keyboard to write the chnages in to the file and then Ctrl+X to exit the text editor.

If you dont have nano editer installed you can get it from main debian mirror or use winscp and go via the file path /etc/ssh and sshd_config is what you edit !

after that try

On debian or Ubuntu run

restart ssh ¬ now you must login again with different port specified by yourself !

Edit i followed this instruction in debian with no problem !