3cx media server - Mapping does not match

[sandstorm]

Brand new install of 3cx on Debian using the 3cx iso image.

Trying to perform a firewall test, however I keep receiving errors saying "testing port 9741.... Mapping does not match 9741. Mapping is 9740"

I receive this error approximately 3 times each time I run a firewall test. The error is always on different ports for the 3cx media server.

Meraki MX64 firewall is configured to forward 9000-10743 to the PBX.

Thank you,

 

[YiannisH_3CX]

Hello @sandstorm

Please check out the following guide that will help you troubleshoot issues with the firewall checker.
https://www.3cx.com/docs/firewall-checker/
If random rtp ports are failing each time though that could mean that the firewall is blocking some packets as it thinks it is being scanned.