User IE browser got prompt for login randomly with IWA authentication
When using IE with IWA authentication, with transparent proxy setup, occasionally, a few users would be prompt for login when using IE6 or IE7. The proxy authentication realm was IWA with Kerberos method enabled. It happens randomly. This is what the request would look like in a packet capture
WWW-Authenticate: NEGOTIATE is used for Kerberos authentication
Open the web management interface and go to Authentication / IWA realm / IWA servers
Uncheck the “Allow Kerberos credentials” setting and only enable BASIC and NTLM, then click "Apply"
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