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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.

by (35.3k points)