Hi,
This has happened three times in a few weeks, version is 8.0.3, it's a very old install with a very "rich" history.
Symptoms:
on occasion DNN starts throwing the following exception (logged in Windows logs, does not show in DNN logs):
----------------------------
Exception information:
Exception type: IndexOutOfRangeException
Exception message: Index was outside the bounds of the array.
at System.Array.Clear(Array array, Int32 index, Int32 length)
at System.Collections.Generic.List`1.Clear()
at System.Web.Mvc.ViewEngineCollection.ClearItems()
at DotNetNuke.Web.Mvc.MvcHttpModule.Init(HttpApplication context)
at System.Web.HttpApplication.InitModulesCommon()
at System.Web.HttpApplication.InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers)
at System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context)
at System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)
----------------------------
When this happens, all websites start malfunctioning and either don't return all page elements (miss graphics, omit CSS files, etc) or return an error and don't load at all. At each "failure" a new error is logged as above.
Recycling the IIS worker process solves the issue, but of course, it could come back at any time.
I had thought it might be connected to the issue I've described here:
http://www.dnnsoftware.com/forums/forumid/108/threadid/531120/scope/posts
so I have made the indexing happen once per hour and wait 50m before retrying. However this didn't help (not much, at least) as the error happened again this morning.
I gave a look at the IIS logs and spotted nothing interesting and no unusual requests.
As I've said this is an old installation which could have loads of undetected problems, I'd like ideas on how to even start troubleshooting.
Thanks,
Sergio

does it help to restart the application in IIS?

---

Cheers from Germany,
Sebastian Leupold

   

Speed up your DNN Websites with TurboDNN

Same for me. Recycling the worker process is the way to do it as I can't hit "restart" from the DNN interface because I'm normally unable to reach it (when the problem is happening).
FY: it's happened once again in the mean time. Quite worrying, I must add.
Thanks!