[memo] summary of the reasons why SSH failed? Remember to come next time.

Preface ：
Because you need the server of the remote laboratory to live , therefore ssh Become a necessity in life , But occasionally （ Always ） Encounter the reason why the connection cannot be made , Put it together , Save trouble next time ……
ps： These are built on previous successful connections ssh On the basis of , If you haven't connected, it is suggested to find relevant tutorials ~

1. Check whether the intranet of the school is opened VPN, Open an intranet website to test . This step ensures that the network state of this machine is normal .
2. Check whether the server is connected to the campus network , Because it may be disconnected , It may also be connected WiFi.（ May need the help of some kind people in the Laboratory ）
3. Test if you can ping Through the server IP, If not, the commonly used ports may be shielded by the intranet , Try adding or replacing an unused port .（ This time, it's because the upgrading of the school network has made ordinary users VPN Common port numbers are forbidden , If it weren't for the school post, I'm still confused ……）
4. Test this machine ssh Is the service running normally .
5. Restart the machine .（ Start metaphysics ）
6. Check your server's trust list IP Not deleted .（ Generally, it will not be deleted ）
7. Not yet ？ Please restart the server for a try .（ Use with caution unless you have to ）

I hope you can connect to the server every second , Wish every time GPU Are idle and can be used , I hope the boss can equip more servers and buy more cards , May the experiment go smoothly ！

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$$Author:oftenByevenNoOnclothingservicedevicethefoldmillOfChier$$