Windows implements remote with Putty login to manage Ubuntu, or log in to a virtual machine where Ubuntu login is not on the solution.
1. Make clear that you can ping the remote Ubuntu or virtual machine.
2. If you are unable to log in, the reason for the analysis is that most of them do not actually open Ssh-server services. The ultimate success method is as follows:
sudo apt-get install Openssh-server
Ubuntu is installed by default openssh-client, so it is not installed here, if your system is not installed, then use the Apt-get installation can be.
Then confirm that the Sshserver is started:
Ps-e |grep SSH
If only ssh-agent that Ssh-server has not started, need to/etc/init.d/ssh start, if you see the sshd that shows that Ssh-server has been started.
Ssh-server configuration file is located in/Etc/ssh/sshd_config, where you can define the SSH service port, the default port is 22, you can define yourself as a different port number, such as 222. Then restart the SSH service:
Sudo/etc/init.d/ssh Resart
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Windows Putty cannot connect to virtual machine Ubuntu