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# from https://ping.force.com/Support/PingFederate/Integrations/How-to-configure-supported-browsers-for-Kerberos-NTLM#chrome
How to configure supported browsers for Kerberos and NTLM
Published: 01/25/2018
The PingFederate Integrated Windows Authentication (IWA) Adapter supports the Kerberos and NTLM authentication protocols, but some browsers need to be configured to utilize them. The following guide will define which settings are necessary in each browser.
For Kerberos and NTLM authentication, the PingFederate IWA Adapter utilizes the SPNEGO (Simple and Protected GSS-API Negotiation) mechanism to negotiate either Kerberos or NTLM as the underlying authentication protocol. Each browser below supports SPNEGO, but differences exist that may affect which protocol is negotiated in each instance, due to the combination of browser and OS.
The PingFederate IWA Adapter supports the following browsers: