If you run both IIS (Internet Information Services) and Apache on the same machine, there is the potential for a port conflict to occur. In a typical case, IIS and Apache both run on port 80 by default. To resolve this problem:
Do not run both IIS and Apache on the same machine. If IIS is not being used, uninstall it. Also, in some cases you may be able to switch the application server to IIS or Apache and uninstall the one that is no longer being used.
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Switch the default website port in IIS to something other than port 80. The procedure to change the port will differ slightly depending on the version of IIS you run. Generally, the port number is found on the Properties page of the web server's default website (right-click Default Web Site and choose Properties). In the TCP Port box, change the number to something else (e.g. 90).
NOTE: Changing this port may cause connectivity issues on networks that use routers and firewalls. The URL http://myserver/ProficyPortal will no longer work. Use the following URL instead: http://myserver:##/ProficyPortal (where ## is the assigned port).