Your users complain that graphics aren’t appearing correctly – check DNS.
The ISA or TMG firewall is acting inconsistently – check DNS.
The ISA or TMG firewall can’t authenticate users – check DNS.
That’s right – DNS is the major culprit in ISA and TMG firewall issues.
Check this article by Yuri Diogenes on another case where DNS was the problem.
Thomas W Shinder, M.D., MCSE
Sr. Consultant / Technical Writer