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Messages is one of the original iPhone (now iOS) apps shipped with the iPhone. It is included in macOS since OS X Mountain Lion. This tag also should be used for all iMessage questions.

3 votes

How to find culprit blocking TCP ports 80, 443, and 5223 on macOS?

You can check to see if the ports are already in use by another application by using the command lsof -Pn -i4 | grep :YOURPORT. For example, when I run it I get: $ lsof -Pn -i4 | grep :9300 testApp …
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