Keep linking in SSH

[Zitian Guo]

Hi all,

I ssh to a server.  If I do not touch the key board for about 2 minutes, my
monitor gets freezing.  This troubles me a lot because I need to open more than
2 terminals to work.  After I worked on one of terminal for a little minute, the
other one get freezing.
How to fix this?

Thanks!

ZG
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