School Networking Issue - Random disconnecting machines - Plea for help :)
We are currently experiencing a strange issue on our network and I am hoping someone might be able to give me some suggestions ☺.
What we run: Windows Server 2003, CC4, XP workstations, two networks an admin and a curriculum. The admin network is vanilla.
We are getting random computers disconnecting from our network. Sometimes single machines other times whole classrooms or 4 classrooms at a time. This has been happening since September sporadically. Over the summer we had a new CCTV system (avermedia) installed, two backup servers using backup exec and a new HP switch connecting one of the backup servers at the other end of the school. We did also set up a separate OU on one of the curriculum servers and set up a set of windows laptops. But this was set up 6 months before the issues started happening although we did make on change to a group policy allowing for the users my documents to be mapped.
When machines disconnect they loose their IP address and DNS servers.
These disconnections happen on both our admin and curriculum networks.
Computers will loose network connection (get the yellow warning triangle in the system tray saying “no or weak signal”). The users loose access to the internet and my documents, shared drives and database software like access fails as it has lost connection. To gain connection again some just require unplugging the Ethernet lead and plugging it back in. Others (when whole rooms go) require the switches they are connected to be restarted.
When the machines disconnect the error logs just show that the RM service host failed. But I imagine this is as a result of the disconnection. I am leaning against an RM issue as it is happening on our vanilla admin network.
On the core switch we get errors building up on random ports that when left on the original core switch went up into their thousands in a few weeks.
More recently (February onwards)we have started having Group policy issues where computers are storing the username of the last user in the login box, some machines not getting software shortcuts until GP update is run on the machine. Mainly this is isolated in the one classroom.
We also recently has an issue where one morning we came in to find the RM service host had crashed and wouldn’t restart. On about the second restart of all the servers it kicked in.
• Stopped backup exec services on all servers and unplugged the backup servers to check backup traffic wasn’t over loading the servers.
• Unplugged CCTV box to check that wasn’t causing issues.
• Restarted all switches.
• Replaced Core switch – when we replaced the core switch it did seem better for a week or so and then started again.
• Changed stacking kit in main cabinet so each switch had 1GB Ethernet connections.
Sorry if this makes no sense but I thought if I put all the information out there it might trigger something with someone.
If the issues are on both admin and curriculum networks would this point to switches being at fault or could it still be a CC4 issue?
Any help / advice would be great thanks as I am out of ideas.