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I tried to open it via:

ufw allow 22/tcp

but didn't work. (bash: ufw: command not found) When i tried to install ufw with apt-get install ufw, i got 'Permission denied. I need it for my real-time chat on flask with SocketIO. How can i do it?

Unfortunately you will not be able to do that (we don't allow arbitrary ports to be opened to the public, and we do not support sockets for our webapps)