almost all web-pages blocked

Hi 

Can you share the error ? Does FG to fortiguard was stable ?

Hi Mogli,

Please help us with the output of 

config sys dns
sh full

Also, please confirm if all the 4 Fortigates had the same issue at the same time? Could you confirm if they are connected to each other?

Regards,

Vimala

Hi Mogli,

As per the detail shared by you after disabling the DNS filter, it started working in this case you need to check the Fortiguard connectivity status at the time of issue

exec ping service.fortiguard.net

exec ping update.fortiguard.net

exec ping guard.fortinet.net

dia debug rating

Regards

Priyanka

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Hi Mogli,
As per the problem you mentioned, it seems to be matching the behavior in below link. Please check below link and try the workaround:

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Web-Page-Blocked-error-when-users-try/ta-p/227243

Regards,
Parteek