The Specified port 443 is already in use (4247433)

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Title

The Specified port 443 is already in use
Description

The following message is received when trying to install the DMZ Gateway

The specified port 443 is already in use.
Cause

Another application is already using port 443. In most cases IIS is installed on the machine and already using port 443.
Resolution

Define a different port that the DMZ gateway can use or install the DMZ Gateway on another machine that does not have port 443 in use.

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