NTLM authentication does not work with Explicit Proxy

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I have an explicit proxy test configuration with NTLM authentication;

I have the groups configured in the proxy policy, but while I can authenticate on the computer, I can’t browse the web. In the debug log, it shows the error highlighted in the screenshot it’s unable to read the groups but I’ve already verified that communication between my user and the group configured in the proxy policy is working;

I’m stuck; I don’t know how to fix this.

FortiOS 7.4.11

RBA

Staff

As per the debug output group query is failing. I would suggest re validating the config. This should assist you with configuration Technical Tip: FortiGate explicit proxy authentication with Kerberos | Community