Secondly, it is necessary to determine whether IPtables of Linux host is turned on, and further to determine whether 22 access is turned on.

Then according to the access mode of the network card, if it is a bridge. Direct access to the Linux host, if it is NAT, you need to map the port in the network card editor. The host to be mapped is your 2008 system, and 22 of them are not occupied by other applications.

In the stand-alone host mode, both the host and the machines other than the host are inaccessible (this is because the design is a stand-alone host and it is impossible for other machines to access).