OpsCenter has been tested to work on Windows XP with service pack 2. The only issue is with the XP enhanced built-in firewall. OpsCenter is designed to communicate with other OpsCenter clients on the same local area network (LAN). This communication is necessary for some functionality to work properly as well as keeping the entire OpsCenter system synchronized. The enhanced firewall will display a warning message saying OpsCenter is trying to access the network. If this communication is blocked, OpsCenter will not be able to operate as designed. OpsCenter does not communicate with the outside Internet except when a user selects the option to check the Internet for updates.