Error using membership in WCF

[y0zh]

Hello everybody. Sorry for my English.
I have a trouble using PgSqlMembershipProvider in WCF services for authentication.
My configuration section in web.config for service

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...

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When i call my method

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[OperationContract]
[PrincipalPermission(SecurityAction.Demand, Role = "admin")]
public string[] AdminMethod()                                      



  RefusedSet=""
  Url=""
  StackTrace:
       in System.Security.Permissions.PrincipalPermission.ThrowSecurityException()
       in System.Security.Permissions.PrincipalPermission.Demand()
       in System.Security.PermissionSet.DemandNonCAS()
       in GISService.Authenticate(String UserName, String PasswordHash) в c:\Users\User\Documents\Visual Studio 2010\Projects\MyProject\site\App_Code\MyService.cs:string 590
       in SyncInvokeAuthenticate(Object , Object[] , Object[] )
       in System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
  InnerException: 
[/quote]
  
  Why it occurs?

[StanislavK]

For Visual Studio 2010, the problem may be caused by the fact that the default hash algorithm was changed from SHA1 to HMACSHA256 in .NET Framework v4. We will set the hash algorithm explicitly in our code, the fix will be available in one of the nearest builds.

As a temporary workaround, please set the hash algorithm to SHA1 in ASP.NET providers of your application. For more information on this issue, please see the following topic:
http://www.devart.com/forums/viewtopic.php?t=17508

If the problem persists, please send us a small test project with which the problem can be reproduced.