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I've been asked to continue installation of a freshly installed Debian system. I can log in there through SSH with no problems. But the connection hangs every time the remote shell sends an escape character. For example, all these commands hang the connection:

mc
apt-get update
tmux

etc. But when I avoid console UI, it works, like in

apt-get update | cat

Any idea what could be the cause, or what should I investigate?

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After all, problem wasn't related to escape characters, but to network in general. Altering MTU seems to fix the problem. Probably when a console UI was started, it transferred too large packet. See also Why does SCP hang on copying files larger than 1405 bytes?.

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