Group Policies Cause Excessive \PIPE\samr Connections on PDC

CAUSE

When a user logs on to a domain in which group policies are implemented, a \PIPE\samr connection is established with the PDC to verify group membership for this user. After the verification process, the \PIPE\samr connection is not released. These \PIPE\samr connections eventually exceed the limit of 2,048.

After this limit is reached, no new processes requiring security account manager (SAM) access can connect to the PDC until you restart the computer. Server Manager and User Manager for Domains require a connection to the PDC for domain administration. Their failure to make this connection results in the preceding error message.