Leandro Díaz Guerra's Blog

I’m working on developing some WCF-Custom adapters for Biztalk 2009, so I needed to add some binding configuration to machine.config.

If you are trying to modify the computer WCF Configuration with the Service Configuration Editor to add a binding extension, behavior, binding element extension, etc., and you are working in a 64 bit environment, this error may occur:

An extension of name ‘persistenceProvider’ already appears in extension collection. Extension names must be unique. (C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config (line 224)

If you open the configuration file (C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config), you’ll probably find that it’s not repeated in that file. But it actually appears in another machine.config file.
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