In my old MVC 4 website, I've used all type of letters (also non hex) in the "machineKey validationKey" in web.config - it worked fine.

But now I've upgraded the website to MVC 5 and it now fails with "invalid non hex values".

Can I tell MVC 5 to use all type of chars?

Why didn't my old site fail?

If I generate a new machineKey validationKey with hex values, I guess that all passwords will be invalid.

Any idea what to do?


Found out that I could append compatibilityMode and it worked - like this...

<machineKey compatibilityMode="Framework20SP1" />


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