Silverlight WCF Service Error

What would prevent one machine from consuming a Silverlight Enabled WCF service some of the time, whilst another on the same network domain, behind the same proxy / firewall / etc.. can fine? Service and app are on the same domain.

I'm writing to the event log when the service comes in, and I can't even see the call come through.

Any pointers greatly appreciated.

Update: After using fiddler, it seems to work if we have fiddler running, but not if we don't. I'm more confused than ever!


Install Fiddler and see what is going on. No other good way to figure this out (sometimes even fiddler can't help).

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