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How to configure a firewall to make Headwind MDM working?
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Here is the list of ports used by Headwind MDM:

80/TCP - HTTP port is used by LetsEncrypt to renew SSL certificates (used once per week, not required if you're using commercial certificates);

443/TCP - HTTPS traffic (note that Tomcat works on port 8443 so a port redirection is set up on the server);

31000/TCP - this port is used to send instant Push notifications to devices.

If you are additionally using the Headwind Remote module, you need to open additional ports, see details here.

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