ProcessWire: ProcessLogin: This request was aborted because it appears to be forged.

[Peter Knight 911]

Hi all
I'm moving a site to a new server and getting the dreaded but common error
 

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ProcessWire: ProcessLogin: This request was aborted because it appears to be forged.

I can access the front-end and internal pages so the .htaccess is working. I cannot see any images on the site although I can access them directly if I put their absolute URL into a browser.

As is this a new VPS, I hunted around for some obvious server-level settings etc which may have been overlooked.

To rule out any issued caused by a site move, I also tried a fresh install. That fresh install has the same problem when trying to access the front end.

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ProcessWire: ProcessLogin: This request was aborted because it appears to be forged.

I have also been around the forums several times for similar threads and the largely contain recommendations about CHMOD. I believe I have tried most of these too.

What is the latest thinking about this error?

Many thanks, P