(FAQ) What port numbers does ActiveSync use?
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ActiveSync requires WorldClient to use port 80 for non-secure (SSL) HTTP connections, and 443 for SSL/HTTPS connections, for both the built-in webserver or running under a third-party webserver like Microsoft IIS. This is an ActiveSync implementation requirement, so it cannot be changed to a different port.
Additional Comments
Note that ActiveSync support requires MDaemon Pro.