When I click on the Plesk link the connection times out.
Plesk runs on non standard port over SSL. If you find you cannot connect to your VPS please make sure the port 8443 is open outbound on your firewall/router/proxy etc.
This is a TCP port. A example rule:
access-list inside_access_out extended permit tcp any host $vpsip eq 8443
The above refers to Cisco ASA rule syntax specifically.