When attempting to authenticate to Artica Proxy in Kerberos mode, you encounter the
ERROR_PROXY_AUTH_UNSUPPORTEDerror.
“ERROR_PROXY_AUTH_UNSUPPORTED” means the browser does not support the authentication scheme required by the proxy.
In Kerberos authentication, the browser and the proxy must negotiate a ticket exchange.
If the browser cannot obtain the proxy’s Kerberos service ticket, the exchange fails and this error is shown.
On the workstation, open a Command Prompt (cmd) and run: klist.[br]
You should see a ticket named HTTP/<proxy-server-hostname>.
If you don’t see the ticket, restart your Windows session or verify your connectivity to the Active Directory server.
