If the firewall checker does not pass successfully, what should you do?

When the firewall checker does not pass successfully, it is essential to contact the network administrator or firewall manufacturer because they possess the necessary expertise to troubleshoot and resolve any issues related to firewall configurations. The firewall acts as a security barrier that can prevent valid traffic from reaching the 3CX system, which could lead to connectivity issues for users and external callers. The network administrator or the manufacturer can help diagnose the specific reasons the firewall checker failed, offer solutions to adjust the firewall settings, or suggest configurations that would allow proper communication through the firewall. Ensuring that the firewall is correctly configured is crucial for the installation and optimal functioning of the 3CX system, making this option the most appropriate action to take when encountering a failure with the firewall checker.