QoS policies should never cause outright connectivity problems. However, if QoS does not meet your performance expectations, you can analyze the policies and the configuration of your network infrastructure to verify that your implementation matches your design. The sections that follow describe techniques for troubleshooting problems with QoS policies and network performance.
Analyzing QoS Policies
You can use the Group Policy Results Wizard to generate a report of QoS policies applied to a computer or user.
To Display QoS Policies
In Administrative Tools, open the Group Policy Management console.
Right-click the Group Policy Results node, and then click Group Policy Results Wizard.
On the Welcome To The Group Policy Results Wizard ...