We have deployed Windows 7 to approx 150 client computers using a standard image in a domain environment. On about 5% of these computers we are not able to connect using SCCM unless we turn the firewall off. Remote desktop will work to the affected computers but when you attempt to start Remote Tools the Configuration Manager Remote Control returns the message "Unable to contact host" If we turn the fire wall off on the client computer the connection is successful. We have compared firewall settings on a working and non working computer and do not find any differences.

Hi, From your description, it seemed the issue is related to SCCM. I suggest contacting SCCM to find the better solution. System Center Configuration Manager http://social.technet.microsoft.com/Forums/en-US/category/configurationmanager Regarding the issue, please check if the following post is helpful. http://social.technet.microsoft.com/Forums/en-US/configmgrgeneral/thread/3b110e22-90f0-49aa-8fcc-b047c41311eb Best Regards, NikiPlease 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.