Troubleshooting Tip: Error 'ERR_CONNECTION_REFUSED' is received while attempting to access FortiGate via a GUI or web browser

[navellano]

Description	This article explains how to resolve 'ERR_CONNECTION_REFUSED' errors when FortiGate cannot be accessed via the GUI or web browser.
Scope	FortiGate v6.2.x and above.
Solution	This problem usually arises after a firmware upgrade: Follow the steps below to fix the issue: Verify the admin cert under global configuration: show full sys global | grep admin-server-cert For example: show full sys global | grep admin-server-cert set admin-server-cert "self-sign" If the output revealed a certificate is missing, reapply the certificate to fix the problem: config sys global     set admin-server-cert Fortinet_Factory end Check the crashlog to see if the httpsd or node process is crashing: di de crashlog read Ensure the httpsd process is running and listening to a port by executing the following commands: diag sys tcpsock | grep httpsd