Do you mean you have some stuck telnet/ssh sessions that you want to close? Please give more details about the issue.
**Please grade this post if you find it useful.
Like when I am telnet_ed somewhere, I can use the CRTL+] key sequence as a escape character to break the connection.
I found a similar solution for ssh:
First press the Enter key, then tilde, and then add a dot and your ssh session will be closed and you can continue your work in back in freed terminal.
Please rate if it helps.