NTLM authentication fails

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NTLM authentication fails

L2 Linker

Hi all,


I'm facing an issue with captive portal and NTLM.  The SSO (NTLM) fails and the users must enter the credentials via the web-form. I've attached print screens from Wireshark and the output from the userid.log:


PAN-OS: 8.0.1

User-ID Agent: 8.0.1-21


[2017/04/25 11:07:48, 0] utils/ntlm_auth.c:get_winbind_netbios_name(172)
could not obtain winbind netbios name!
2017-04-25 11:07:48.411 +0200 Error: pan_ntlm_handleType3Msg(pan_user_id_l3svc_ntlm.c:567): NTLM Auth failure for user got\pete vsys 1



Per Tenggren

Accepted Solutions

Found the issue, the User-ID service was not enabled on the interface used for redirection. 


FYI, it not needed to set the NTML parameters on the firewall if Windows User-ID agent are used. It will act as a proxy for such request. 

Per Tenggren

View solution in original post


L7 Applicator

Has it ever worked?

Browser is IE right?

You have added your firewall into AD domain right (picture below)?



Enterprise Architect, Security @ Cloud Carib Ltd
Palo Alto Networks certified from 2011

Cyber Elite
Cyber Elite

It sounds like NTLM is just either not configured or misconfigured on your User-ID section. I would verify this and make sure that everything there is correct.

It's IE yes, new installation. Do I really need to do that when using external User-ID servers?
Per Tenggren

Yes you need to add NTLM data that creates firewall computer object into domain and gives firewall capability to use NTLM to authenticate users.

Enterprise Architect, Security @ Cloud Carib Ltd
Palo Alto Networks certified from 2011
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