Only SSH v2 is supported. SSH v1 has inherent design flaws which make it vulnerable and it has been generally considered obsolete. Putty can be used for those situations where SSH v1 is required.
Closing SSH embedded session freeze the application.
In the SSH Shell (Rebex) session, click on the Terminal tab and uncheck the Exit command on disconnect option.
SSH Shell Rebex Properties
When trying to use the keypad in SSH, it does not send the correct characters when you type.
In File -> Options -> Types -> Terminal, please set the Disable application keypad mode to True so that the option works globally on all your sessions;
SSH Keypad mode