Clients receives error 691 trying to connect to ISA Server 2006 as VPN Server

Yikes! Not another 691 error on a VPN client connecting to the ISA firewall. What’s the cause this time?

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If you look at the error, you’ll think the problem is an authentication issue, since that what the dialog box says it is 🙂

Yuri Diogenes goes into deep detail in how to troubleshoot these kind of issues in his article over at https://blogs.technet.com/isablog/archive/2009/03/19/clients-receives-error-691-trying-to-connect-to-isa-server-2006-as-vpn-server.aspx

Make sure to have a strong cup of coffee before reading this – it’s a very deep dive.

Enjoy!

Tom

Thomas W Shinder, M.D., MCSE
Sr. Consultant / Technical Writer

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Prowess Consulting www.prowessconsulting.com

PROWESS CONSULTING | Microsoft Forefront Security Specialist
Email: [email protected]
MVP — Forefront Edge Security (ISA/TMG/IAG)

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