Weird loss of network access via browser
This has been happening randomly across our network for a few months now. It doesn't happen often, we get maybe one instance of it a week. It always affects random users, and random computers across the college. So far, only windows XP has been known to have the issue. The solution is always to reboot, which fixes the problem. However we still don't know what is causing it.
The symptoms are that the user cannot access any webpages in IE, they all just say "page cannot be displayed". Sometimes it occurs just after they have logged on, sometimes they may have been logged on for several hours before the issues occur.
In our testing, we have discovered:
- No webpage will load, whether internal or external. It has the same symptoms trying to access the web interface of a printer on the same subnet, which rules out the firewall
- It's not DNS, because it has the same problem whether using the IP address or DNS name (both external and internal).
- It's not internet explorer. Firefox displays the same symptoms.
- The computers affected have been all across the network. There is no one switch they are all connected to apart from the core switches.
All other network services work fine. The user can access their documents, e-mail (outlook/exchange combo) etc.
Clients: Windows XP SP3, IE8, office 2010
DCs: mostly 2003, a couple of 2008.
Has anyone seen anything like this before?