In our company we are having one windows sbs 2011 domain controller and around 50 pcs with Windows XP professional sp3 and some laptops with Windows 7 professional SP2; Antivirus is Symantec Endpoint Protection loaded in separate pc made server and all are configured; working perfectly until today afternoon.
All of a sudden lot of calls started coming to IT ROOM complaining about the lost of connection between dc and the clients. We checked the pc's in our IT ROOM for myself and colleague starting to troubleshoot from our pc's since we also lost the connectivity.
ping not working from any pc to DC
ping not working with default gateway from the pc's lost connection
layer 2 connectivity is ensured OK by connecting my pc through live bootcd and ping works with dc, gateway; I opted for live boot cd since I rebooted my pc and the dc couple of times; no effect
default gateway which is our ADSL ROUTER LAN IP is pinging from the DC and internet is working
DC's antivirus, Symantec Endpoint Protection, is stand alone not in sync with the Symantec server. Also a client pc which is loaded with kaspersky antivirus also having the same problem. So the Symantec Endpoint Protection server possibility can be isolated.
Restarted the DC and chose last known good configuration; same symptom
found one windows server 2003 loaded as a member server in the domain still working; pinging with the DC; able to access the folders in DC ; afraid to restart and check since on a Windows XP machine lost connectivity after restarting
N.B: all the clients are getting IP from dhcp in DC
When pinging request timed out is the result and the gpresult of the client pc's give generic failure
The current problem is temporarily solved !!!
I need a permanent solution.
The full details are at http://social.technet.microsoft.com/For ... e3d9354ac5 where I posted this issue first