Troubleshooting Tip: The firewall GUI is frequently disconnecting

[seshuganesh]

Description	This article describes troubleshooting steps to take when the firewall GUI frequently disconnects.
Scope	All versions of FortiOS.
Solution	Usually, this issue is caused by packet loss between the client (source machine) and FortiGate. The first step is to connect the machine directly to the firewall and access the firewall. This should resolve most issues. If the issue persists, execute the following command in the CLI: diagnose sys top See if any httpsd process got stuck in the D state. If any of the httpsd processes get stuck in the D state, it means that the process could not contact the disk. In this case, it is necessary to reboot the firewall. If there is no httpsd process in the D state, check the following debug output (an example is attached here): diagnose debug crashlog read Example output: 541: 2022-10-28 14:07:15 <00865> Backtrace: 542: 2022-10-28 14:07:15 <00865> [0x009c7cdc] => /bin/httpsd 543: 2022-10-28 14:07:15 <00865> [0x009c7fa0] => /bin/httpsd 544: 2022-10-28 14:07:15 <00865> [0x009c39e3] => /bin/httpsd 545: 2022-10-28 14:07:15 <00865> [0x00988edc] => /bin/httpsd 546: 2022-10-28 14:07:15 <00865> [0x00c3324a] => /bin/httpsd 547: 2022-10-28 14:07:15 <00865> [0x00c33806] => /bin/httpsd 548: 2022-10-28 14:07:15 <00865> [0x00c75f6b] => /bin/httpsd 549: 2022-10-28 14:07:15 <00865> [0x00c76141] => /bin/httpsd 550: 2022-10-28 14:07:15 <00865> [0x00c6ed3d] => /bin/httpsd 551: 2022-10-28 14:07:15 <00865> [0x00c3768a] => /bin/httpsd 552: 2022-10-28 14:07:15 <00865> [0x00c4c3aa] => /bin/httpsd 553: 2022-10-28 14:07:15 <00865> [0x00c4c696] => /bin/httpsd 554: 2022-10-28 14:07:15 <00865> [0x00c4cbf2] => /bin/httpsd 555: 2022-10-28 14:07:15 <00865> [0x00c48680] => /bin/httpsd 556: 2022-10-28 14:07:15 <00865> [0x00c481cf] => /bin/httpsd 557: 2022-10-28 14:07:15 <00865> [0x00435c20] => /bin/httpsd If there is any output like the above, share this output to a TAC ticket. If there is no crash, execute the following command and share the output to a TAC ticket: diagnose debug reset diagnose debug console timestamp enable diagnose debug application httpsd -1 diagnose debug enable After, access the firewall again. It should show some errors. Afterwards, disable the debugging: diagnose debug disable Try to collect the FortiGate support tool output for any GUI-related issue and share the output to a TAC ticket: FortiGate Support Tool