I received this on the TMG, dind’t take me too long to realise what I’d done. Basically, I had changed DNS  internally for a server so that it was pointing to the TMG’s NLB address. My web forwarder was also using the fqdn. I added the IP address in under the rule and everything is ok now

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Traffic Is in a Proxy Chain Loop, 10.0 out of 10 based on 1 rating