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I have question about blocking local connections by desktop firewalls. Is there any trend where firewalls block local connections by default or rather they allow local connections.

I want to make app that communicate with second app on the same machine. And i do not want problems with config firewalls (Windows firewall including)

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As long you use only (both LISTEN and CONNECT), no Firewall should be a problem.

If there is a FW software dump enough to bother the user to ask permission for, he/she will be trained to klick "OK" anyways.

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