We have a re-occuring error on our IIS web server farm event logs.
The current setup is that we have 6 web servers on IIS6 and Windows 2003 connecting to the same set of ASP pages stored on a Windows 2008 File Server using a UNC Share (ip address). The error is occurs for different ASP pages as follows:
Warning Event ID 9
Warning: ASP: UNC Access failed for file - \\10.0.0.4\PRODUCTION SERVER\V6\PORTLETS\PORTLET-SPACER.ASP with the error = -2147024832.
Error Event ID 5
Error: ASP: UNC Access failed for file - \\10.0.0.4\PRODUCTION SERVER\V6\WWW\372\1001127\3243165.ASP with the error = -2147024832.
The errors occur at random intervals about 1-2 times a day on average On the website the user may experience a message Network Path Not Found. The error can occur for a few seconds or several minutes and sometimes during peak load and after hours. It is as if the File Server can not be found on the network for a short period of time. However on the File Server there are no error messages whatsoever. I have seen this error occuring more as we add more websites and the websites get busier.
So it may suggest some kind of bottleneck but the network bandwidth is still under 15% utilisation on a Gb network with 2 switches. We don't use DNS on the internal network. It is fairly simple with every server on the same subnet 10.0.0.x and communicating via ip addresses. This error has plagued us for a few years now. In that time we migrated from Windows 2003 storage Server to Windows 2008 for our File Server.
We have changed to HP Pro Curve Switches. We have virtualised IIS and File servers into VMWare 3.5. We have replaced all the network cables with Cat6 and all replaced the hardware on all physical ESX servers. So anyone trying to point to a network card/switch issue I can safely say that is not the problem. I have configured the recommended settings for UNC Sharing (i.e. MaxCmds etc.) for both File Server and IIS machines.
Pretty much I have exhausted every possible suggestion or recommendation to try to troubleshoot this problem but it still keeps occuring. Does anyone here have the expertise to help?