Technical Tip: Cannot access the GUI after the upgrade to v7.2.5

KumarV · ‎10-08-2023

Description

This article describes how to fix the issue when the FortiGate GUI is not loading after the upgrade to v7.2.5.

Scope

FortiGate v7.2.5 and onwards.

Solution

Make sure to use the correct admin-sport.

For example, the settings shown below use port 8443.

config system global

set admin-sport 8443

end

https://example.fortiddns.com:8443 or https://<Ipaddress>:8443 should be used.

Check if the admin-server-cert settings have the right certificate with hash above SHA-1 (which is not supported anymore).

Starting in FortiOS v7.2.5, users should use the built-in Fortinet_Factory certificate, or SHA-256 and higher certificates for the web management interface.

For example:

config system global

set admin-server-cert Fortinet_Factory

end

SHA1 would not be supported anymore from v7.2.5 onwards.

Related document:
Remove support for SHA-1 certificate used for web management interface (GUI)