The extensions fail to make outbound calls or receive inbound calls. The admin logs in the Web Configuration Panel to check the problem, but the screen shows “502 Bad gateway”. After rebooting, everything goes OK, but the above problem repeats again a while later. What’s wrong?

It’s because that MyPBX has mapped the port to WAN without configuring firewall settings (i.e. no definition of corresponding common rules) and has been attacked. Please configure the firewall settings according to MyPBX User Manual. 

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