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Consider this code attempting to create an Active Directory account. It's generating an exception here with a certain set of data. It's not clear right now what's causing the exception.
var user = new UserPrincipal(someValidUserContext, ".x-xyz-t-FooFooBarTest", "somePwd", true); user.UserPrincipalName = "[email protected]"; user.SamAccountName = ".x-xyz-t-FooFooBarTest"; user.DisplayName = "Some String 16 chars long"; user.Name = "Some String 16 chars long"; user.Description = "Foo BarBaz 12 more characters"; user.AccountExpirationDate = someDateInFuture; user.UserCannotChangePassword = true; user.Save(); // exception thrown on Save(): // A device attached to the system is not functioning 
PrincipalOperationException was unhandled by user code: A device attached to the system is not functioning
What's causing this exception, and how can you work around it?
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This error means that your computer cannot properly communicate or transfer data with attached device. Thus, you are likely to get this error when your PC is connected with removable drives and there might be something wrong with connection, driver compatibility or USB port quality, etc.
To create a new user, follow these steps: Click Start, point to Administrative Tools, and then click Active Directory Users and Computers to start the Active Directory Users and Computers console. Click the domain name that you created, and then expand the contents. Right-click Users, point to New, and then click User.
The sAMAccountName attribute must be 20 characters or less.
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