http:\\servername:1090\ContentServer\ContentServer.dll?serverInfo
replacing server name with the name of your server Content Server has been installed on.
A response below will show that the Content Server is running.
It is worth trying this on the server and remotely on your desktop as the connection from your desktop my not work due to the firewall in Windows 2008 Server on your server.
If the firewall is blocking the Content Server from responding, create a inbound firewall rule for Content Server using TCP for the Content Server port, please follow steps on below for resolve . Then try the url above to see if the Content Server is responding remotely.
Resolve Content Server was blocking by Firewall :
1) In 'Administrative Tools' open 'Windows Firewall with Advanced Security'
2) Right click over 'Inbound Rules' and select 'New Rule...'