We have a Windows XP Pro machine running a web server which all the XP Pro client machines on our network access. Suddenly it has stopped serving pages. On futher invesitgation the machne can't be pinged by any of the client machine or by the router (to which they're all connected) however it can ping the client machines and the router. I created a shared folder on the web server however none of the client machines can access this folder. I have disabled the Firewall on the web server and uninstalled AVG Anti Virus (which has been known to cause problems). The last time we know for sure that a client machine accessed the web server was last Wednesday so I rolled the web server back to the Friday before that using System Restore but this made no difference. The technical support team that supports the software running on the server have checked the settings for the web server software and they can find nothing wrong, in fact it works fine when used on the host machine - only the network clients can't get pages from it.
We have made a small amount of progress - we have discovered that if you boot the machine in 'Safe Mode with Network Connection' all these issues vanish. I'm beginning to wonder if the problems are caused by a Firewall issue (the Firewall is disabled by default in Safe Mode I believe) - is there any way to verify that the Firewall is definitively off other than believing what the Windows GUI tells you? I have messed about with 'NETSH FIREWALL' via the command prompt to no avail.