Hello All, I did the search on the forums but could not find similar issue, therefore I am posting new topic. After upgrading the 3CX from v14 to v15 we are getting this error message when we perform 3CX firewall check: testing port 5060... failed testing port 5060... unmatched mapping (49152) Before the upgrade with v14 firewall check passed 100% ok. We upgraded the installation on the same server (vm 2012R2) and no changes were performed on our network. 5060 port is forwarded to internal IP of 3CX server and all phones (desk phones and 3CX app on mobile and computers are working OK). What could this error mean? All other firewall tests are passed. Thanks for your help!