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The use of a custom port is not widely supported by chameleon reader apps at this time (Sept, 2018). There are only a few that currently allow the port to be customized including weather readers and blade runner. To troubleshoot Reader Ports accessing the outside world, visit THIS article.
Flow
To install Flow using a custom port - specify it by appending a colon and the port number to the database hostname/ip address when prompted at the database config step of the installer.
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