I have a strange issue where my Global Protect SSL Client connects to the firewall with no issues. I get the IP, the routes and the DNS servers but I don't get anything listed in the DNS Suffix entry. I have configured the DNS Suffix correctly under 'Global Protect Gateway', 'Client Configuration', 'Network Settings' and can even see the DNS Suffix being received from the agent during my agent debug when trying to connect but nothing shows up in IPCONFIG.
Did you had a chance to look at https://live.paloaltonetworks.com/t5/Management-Articles/DNS-Suffix-is-not-Listed-under-GlobalProtec...
If this is already verified, could you check if the issue is specific to any Client OS/ GP version?
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