FortiGate sdwan http probe

teams.microsoft.com resolves to 52.123.128.14 and 52.123.129.14.

Or did I misunderstand your question?

Hello Zhuo,

Yes, like AEK wrote , the FQDN is resolved to 52.123.128.14 and 52.123.129.14, but there is a way to find the IP address to which this FQDN is resolved , because sometimes the DNS of your PC and FortiGate could be different and you can get a different IP address.  Try to filter the session list for the destination port, source IP address of wan1 and protocol number :

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diag sys session filter src XXXXX.XXXXX.XXXX.XXXX <---- source IP of WAN1
diag sys session filter dport XXX <---- port used in SD-WAN for probes, according to screenshot it's TCP 80
diag sys session filter proto 6 <---- protocol No6 for TCP, if UDP is in use, put 17
diag sys session list

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Best regards,

Fortinet