Websites behind Cloudflare not working

[fgatko]

Hello,

in our company we have Fortigate 80F (v7.0.13 build0566 (Mature)). I'm new in company and totally newbie in Fortigate (used mikrotik and cisco in previous work).

We found problem that websites which use Cloudflare DNS not working.

Tried this: https://community.fortinet.com/t5/FortiGate/Technical-Tip-Block-QUIC-Protocol/ta-p/197661

websites still don't work.

Chrome shows me: ERR_QUIC_PROTOCOL_ERROR
If I disable QUIC in Chrome too, it shows me: ERR_NETWORK_ACCESS_DENIED

Edge: ERR_QUIC_PROTOCOL_ERROR

Will be very thankful for your help.

[abarushka]

Hello,

You may consider to sniff traffic towards the server in CLI "diagnose sniffer packet any 'host <destination IP address>' 6 0 a" or GUI (https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Packet-Capture-on-FortiOS-GUI/ta-p/1...). It will help to verify whether TCP and TLS sessions are established successfully.

[fgatko]

Hello abarushka, thank you for your reply.

I tried sniff in console but seems it doesn't work fine.

$ diagnose sniffer packet any 'www.qr.io'
interfaces=[any]
filters=[www.qr.io]
pcap_compile: can't parse filter expression: syntax error

$ diagnose sniffer packet any 'host qr.io'
interfaces=[any]
filters=[host qr.io]
pcap_compile: unknown host 'qr.io'

[abarushka]

Hello,

It is necessary to specify IP address as a filter instead of the hostname (i.e. "diagnose sniffer packet any 'host 188.114.97.3' 6 0").

[fgatko]

Hello,

diagnose sniffer packet any 'host 188.114.97.3' 6 0
No permission for this admin to read any data
Command fail. Return code -37

---

So I contacted person who made a setup of fortigate for us.

Will contact you soon.

Thank you.

[abarushka]

Hello,

I suspect that permission (to run "diagnose" command) is not set. Please find the details by following the link below:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Change-in-behavior-of-diagnose-commands-fo...