Methods and steps of SSHD remote connection troubleshooting

Step 1: the link is normal

Method to check link availability: ping 10.0.0.200

Reasons for obstruction:

A there is a problem with the physical line / the physical host is shut down

B Network security devices block the function of ping

C whether the virtual host network card address is set correctly

D is the virtual network card (vmnet8) turned on and configured correctly?

E whether the virtual host network service is turned off

Step 2: have a network security policy to block access

A firewall is not turned off

B SSH service configuration can also prevent users from connecting remotely

Step 3: the remote service is not enabled

Check whether the remote service is enabled: telnet 10.0.0.200 22

In the network, each network service will be numbered as a network service port.

SSH service port number-22

The reason why the connection failed:

A remote service is turned off

Systemctl start sshd

B the network card setting error in the virtual network editor can be restored by default.

C the virtual software program is not running properly

Check whether the virtual software service is enabled-- window + r--services.msc

Open or restart all services