Cloudfare Loadbalancer generating 404s

We have used the Cloudfare loadbalancer to manage a pool of webservers and distribute requests to them.

Normally all is ok.

but over the past week we have been experiencing a problem which means that quite often we see a 404 message come back from a web service call.

So, if we do a web service call to the cloudfare load balancer, we get regular 404 errors.

However, if we do direct calls to each of the web servers - we don’t get any 404 errors at all - on any of the servers.

I’ve been checking the configuration of the load balancer and it all seems ok - it certainly hadn’t changed preceding the errors appearing.

Is there anything logical I can check ?

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