I have found I have to hit the CTRL-SHIFT-6 combo twice in rapid succession for it to work, but I am using Hyperterm, so who knows.
Thank you so very much, that is a great tip.
I agree that hitting the key stroke combination several times seems to be necessary in many instances - including times when I am not using Hyperterm.
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Try this from the console.
hold down Ctrl+shift+6, release and then press x immediately. This may work depending on IOS
The keystroke combination you give is right if you want to suspend a telnet session. But to stop an executing command you do not need the x. A Ctrl+shift+6 is enough.
It may depend on what command you are trying to stop. I find that for ping and traceroute it is pretty effective (though it may take multiple entries of the key stroke combination). For other commands it may not be effective.
u can also set the break character by using "terminal escape-character Z" (I use z).
when I want to break a trace or oing, i simply hit z.