On Thu, 8 Oct 2015 11:18:17 +0800 Hua Wang wrote:
I tried to ping the server, and it can accept all data. Is there a good way to check it?
ssh -v, ssh -vv and ssh -vvv might give you some interesting information.
The problem came out while reinstalling centos 7.7.
Since you're apparently using some kind of an unofficial or non-standard version of Centos, you might want to try using a current (regular) one instead.