When I add new binding to 80 port for TFS web access App on IIS:

my build service does not work but:

How can I fix my build service and save binding to 80 port? Or is there another way to get access to TFS WebAccess on 80 port?
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Martin Hinshelwood has a blog post on this titled: TFS 2012 – Issue: Stuck builds in Team Foundation Build with no build number
Long story short, your build config needs to allow multiple host headers