Forefront TMG 2010 Error

Not saying this will definitely fix the problem, but if you get this error when visiting some sites (esp. ebay!):

“Technical Information (for support personnel)
Error Code: 502 Proxy Error. The data is invalid. (13)”

Before even walking to the brick wall (against which you will bang your head with this problem) try installing this hotfix:

(having of course read up about the update at

I got pointed to these 2 links by:

Which didn’t describe the problem accurately at all, but I guessed that maybe SP1 for ForeFront had introduced some HTTP compression errors so installed the above hotfix and this sorted it. I have to say that the brief time I spent surfing for this, it does only seem to be ebay that causes this problem.

UPDATE: you still need to turne HTTP compression off…


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