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I'm receiving a server not found when logging in to Plesk from shell or Terminal.  Specifically the error message I'm receiving is

Can't connect to the server

My first reference for this fix is to run the command 

sudo service httpd restart

Running this command you will see the following in Terminal

Stopping httpd:                                            [  OK  ]
Starting httpd:                                            [  OK  ]

If this doesn't fix your error... and it didn't for me, my next step is to run a reboot command.  However, note this command will shut down your websites and emails on the respective server.

sudo reboot

By running the reboot command you should see the following in Terminal

Broadcast message from root@your-host.com
  (/dev/pts/1) at 11:05 ...

The system is going down for reboot NOW!
-bash-4.1# Connection to 123.45.678.901 {your server's ip address} closed by remote host.

Give it a minute or two and you should be back up and online.

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