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Norton Internet Security Message

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How do I configure my firewall setting on my Mac's Norton internet security to avoid repeated warnings each time I login: "An unknown service (port xxx) is starting on your Mac" where port xxx is one of the non standard port numbers: 996, etc.

 

 

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Hi 

 

 

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The Mac version is Sierra version 10.12.3 running on a Mac mini from late 2014.  Norton Security is Version 6.0

 

Thanks, Paul (beatrice's husband)