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I had developed a WCF Service in .net framework 4.0 and Client in .net framework 3.5. Does it create a problem? I mean it is possible to for .net framework 3.5 can consume the service which is build on .net framework 4.0 and using binding "wsDualHttpBinding"? I had tested in the two situation where one service is created by using .net framework 3.5 and another one is created by using .net framework 4.0. when I try to connect service which was created by using .net framework 3.5 and which is hosted in IIS then it get connected. And another one when I try to connect service which was created by using .net framework 4.0 and which is hosted in IIS then it get unconnected. this is tested in Localhost. any suggestion?

Thank you in advance.
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No,Always you can do this.B'cos it's having backward compatibility with the earlier version.
So, if you're having something wrong,it should give the same error on your local host also.Hence, you don't have any problem with local host means where may be the problem with something else.So try to find that thing by using log information of your service.
 
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