SYMPTOMS
If a slow network connection is detected during the initial logon process, the logon script may not run. Resolution: try one or more of the following policies.
1) go to MMC>Local Computer Policy>User Configuration>Administrative Templates>System>Group Policy, check Enable Group Policy slow link detection, and then type 0 in the Connection speed box.
2) Enable Scripts policy processing, and then select the Allow processing across a slow network connection check box.