Gather system information

Your FortiMail unit provides many features to aid in troubleshooting and performance monitoring.

Use the GUI's dashboard and the CLI commands to define the scope and details of your problem. Keep track of the information you gather. Fortinet customer support may request it if you contact them for assistance.

In the advanced management mode of the GUI, go to Monitor to view the system information and all other mail delivery information. For details, see Monitoring the system.

You can also use the CLI diagnose commands to troubleshoot both the hardware and firmware issues. For details, see the diagnose command chapter in the FortiMail CLI Reference.

Before using a diagnose debug command, make sure to enable the debug feature by entering:

diagnose debug enable

Check port assignments

There are 65535 port numbers available for each of the IPv4 TCP and UDP stacks that applications can use when communicating with each other. If someone recently changed a FortiMail or network port, that may be part of your problem.

In addition, some ports may be assigned to other Fortinet or third-party devices on your network.

Many UDP and TCP port numbers have internationally recognized IANA port assignments and are commonly associated with specific applications or protocols. FortiMail default port numbers usually follow those port number assignments. See also Appendix C: Port Numbers.