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Port 3389 is the default port used by Remote Desktop Protocol (RDP) on Windows systems. In discussions on WindowsForum.com, users report that Windows 8.1 Pro may unexpectedly re-enable remote connections, reopening port 3389 even after the user has explicitly disabled remote access via the system settings. This behavior raises security concerns, as an open RDP port can be a vulnerability. Community members seek explanations for why the setting reverts and request methods to permanently disable remote connections and keep port 3389 closed. Troubleshooting steps often involve checking Group Policy, services, or third-party software that might override the manual setting.