Description
This article explains how to solve issues when the error message :- "valid certificate is required to login" is displayed following a FortiOS firmware upgrade.
Scope
FortiOS all versions.
Solution
Following a firmware upgrade of the FortiGate it might be required to check the self-signed certificate configuration in the system global menu on the CLI if unable to login into the device via HTTPS :-
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# config system global
# set admin-server-cert
# end
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