Unable to authenticate using FBA with LDAP on ISA Server 2006

This is my new post and it is on the ISA/TMG product team site

https://blogs.technet.com/b/isablog/archive/2010/08/06/unable-to-authenticate-using-fba-with-ldap-on-isa-server-2006.aspx

and it talks about authentication problems if LMCompatibityLevels are not as required. Please have a look.