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Recently we upgraded Web Farm web site to ASP.Net 4.
We studied .NET Framework 4 Migration Issues and, fortunately, didn't found any serious issues, related to our site.

Before all sites will be converted to .Net 4, for forms authentication cookies to work across .NET Framework versions, we've added


<machineKey validation="SHA1" />

Tests were successfull on single computer, but when we started to test new version on Web Farm, we started to see intermittent strange errors.
Finally it was found, that the problem was that .Net4 has it's own copy of machine.config, and machineKey validationKey="0000...0000" and decryptionKey="00...00" were not copied from  ASP.Net2 copy of machine.config
Note that "for a web farm, you want to manually put in your own keys and make sure they are EXACTLY THE SAME on each machine in the farm."(Generate Machine Key Elements for Web Farms )


We had to manually copy <machineKey> entry to .Net4 copy of machine.config on each machine in the farm.

Posted on Saturday, June 26, 2010 9:59 PM ASP.NET | Back to top

Comments on this post: Upgrade to ASP.Net 4 on Web Farm

# re: Upgrade to ASP.Net 4 on Web Farm
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The computer problems always drive me crazy, I want a program to solve my slow computer, several days ago my friend recommend me a software tuneup360, now I'm waiting for the result.
Left by jolin on Jan 10, 2011 1:51 AM

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