Hi All, In our pilot group of 15 or so Windows 7 desktops we are experiencing a strange issue I would appreciate your input on: In a random fashion, most systems will eventually show us a blue screen at logon (not a bsod b.t.w.) that mentions: "Could not connect to the System Event Notification Service". At this moment further loggin on is not possible; in fact the only remedy seems to be to hard shutdown the system & then after reboot all will be well, for a few days. I've been doing a bit of investigation; on three systems I have been able to pin down a consistent set of error messages in the system log at the time of the issue that mention that a number ofservices have unexpectedly ended. (event ID 7031) The services are: · Group Policy Client service · IP-Helper service · Server service · Multimedia class service · User Profile service · Task Scheduler service · SENS (de welbekende: System Event Notification Service) · Shell hardware detection service · Themes service · WMI service I noticed almost all these services rely on RPC to run (except for the Themes service unfortunately). I have checked the domain controllers: no issues there: nice & clean eventlogs. The machines all run based on the same image. Unfortunately the issue is not reproducable (so far); it often takes a number of days to return. I have been told that people feel that 'loggin on quickly' seems to make the problem appear more often. Any suggestions of what might be causing this, and maybe some ideas about what tests to do to confirm the issue or how to investigate further? Regards, Paul www.servercare.nl

Hi, Before you modify the registry, please make a backup for your registry first, you can refer to the following link: http://windows.microsoft.com/en-us/windows7/Back-up-the-registry Please check the registry key under HKLM\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon\GPExtensions and delete it. Regards, Sabrina TechNet Subscriber Support in forum. If you have any feedback on our support, please contact tngfb@microsoft.com This posting is provided "AS IS" with no warranties or guarantees, and confers no rights. |Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi Sabrina, Thanks for picking this up. Do you have some background information that tells me a bit more about what this registry key does? I've tried to bing it (and google as well ;-) but could not really find much more info. (besides what appears to be ancient 2000 info) thanks! Regards, Paul www.servercare.nl

Hi, This issue can be caused by the some GP extention. The third-party programs and additional Microsoft services that install client-side extensions register those components in the GPExtension. Please go to gp to see if some applications or service extention is causing error. If so, please take permission to delete the related registry key under gp extention. Before you modify the registry, please make a backup for your registry first, you can refer to the following link: http://windows.microsoft.com/en-us/windows7/Back-up-the-registry Please login safe mode with local admin and check the registry key under HKLM\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon\GPExtensions to delete it. Reference: Identifying Group Policy Client-Side Extensions Regards, Sabrina TechNet Subscriber Support in forum. If you have any feedback on our support, please contact tngfb@microsoft.com This posting is provided "AS IS" with no warranties or guarantees, and confers no rights. |Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, Sorry for not clarifying it. I have edited my previous post. Regards, Sabrina TechNet Subscriber Support in forum. If you have any feedback on our support, please contact tngfb@microsoft.com This posting is provided "AS IS" with no warranties or guarantees, and confers no rights. |Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, I was wondering how everything is going. If anything is unclear, please let me know. It is my pleasure to be of assistance. Regards, Sabrina TechNet Subscriber Support in forum. If you have any feedback on our support, please contact tngfb@microsoft.comThis posting is provided "AS IS" with no warranties or guarantees, and confers no rights. |Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Thanks Sabrina, I have asked one of our technicians to modify one of the systems that seem affected. Unfortunately the problem only occurs sporadically, so we'll have to give it a few weeks.. Regards, Paul www.servercare.nl