Do you have a second software based firewall installed? Did you update one of your security suite softwares like McAfee or Norton from an older version that did not contain a firewall program?
Go to a Command Prompt on the server and type MSCONFIG and hit enter. Look at the Services tab and Startup tab to see if there is anything out of the ordinary.
As a second method of troubleshooting, go to a command prompt and type NETSTAT -A. This will show what ports are in use and also NETSTAT -B will show which ones have active connections and what program is initiating the connection.
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