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You're using ntlm with it - what did you expect?
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I have published my MOSS site using ISA 2006. The problem is that after logging in using forms based authentication page of ISA, it still prompts me after that using a standard windows logon box to login again.<br />
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The sharepoint site is configured for Windows authentication using NTLM. I have SSO turned on for the ISA Listener publishing the site<br />
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Any idea why I have to login using both forms authentication on ISA and then windows authentication?
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I have published my MOSS site using ISA 2006. The problem is that after logging in using forms based authentication page of ISA, it still prompts me after that using a standard windows logon box to login again.

The sharepoint site is configured for Windows authentication using NTLM. I have SSO turned on for the ISA Listener publishing the site

Any idea why I have to login using both forms authentication on ISA and then windows authentication?

Login Twice When Publishing Sharepoint With ISA

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.

Microsoft Forefront ISA Server

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.