Facebook API - Invalid signed request. (Invalid signature.)?

Perhaps you have done this already but I have had the same issue and all I had to do was add my app ID and secret to the web.config.

Perhaps you have done this already but I have had the same issue and all I had to do was add my app ID and secret to the web.config. In the web. Config file, my issue was on this line.

Ensuring these are populated and accurate should solve the issue. Hope this helps!

You must check your app settings on facebook. Take care about the URLs and other settings.

1 Pretty lame answer to cash in on the bounty. Checking the settings were correct was the first thing I tried before posting. – Echilon Jun 28 at 18:18.

I think you will find this has something to do with cookies. I was playing around with the different sample web sites that have in the sdk. I cleared my cookies and then I stopped getting that error.

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