If you get this when mapping a drive:CAUSE
This behavior occurs when the "Do not allow storage of credentials or .NET Passports for network authentication" Network access policy is enabled.WORKAROUND
To work around this behavior, follow these steps:
On the Management Server, click Start, click Run, type gpedit.msc, and then click OK.
Under Computer Configuration, expand Windows Settings, expand Security Settings, expand Local Policies, and then expand Security Options.
In the Policy pane, right-click Network access: Do not allow storage of credentials or .NET Passports for network authentication, click Properties, click Disabled, and then click OK.