401 error is shown if CreateOAuthTokenProvider or CreateWindowsTokenProvider was called with password ends with ++

Hi, 

we noticed a very strange problem in Service Bus 1.1 for Windows.

If token provider is created with specific NetworkCredential, and password ends with ++, like "MyPassword123++", then error is returned in subsequent use of the provider:

The token provider was unable to provide a security token while accessing 'https://<my server>:9355/<myns>/$STS/OAuth/'. Token provider returned message: '<Error><Code>401</Code><Detail>The user name or password is incorrect...

The error is the same for TokenProvider.CreateOAuthTokenProvider and TokenProvider.CreateWindowsTokenProvider (only endpoint address changes).

User could successfully login into computer using "MyPassword123++".

If I change user's password to something else, like "MyPassword123", it works fine. 

Is it a know issue? What can be the reason?

Thanks

PS. It looks like any password with + does not work. TokenProvider uses space instead.