I have a web application that works fine for a while (a few days) and then starts throwing FileLoadException's when instantiating a class that references an external dll.
- I'm not explicitly loading the assembly with any of the Assembly static methods. I'm just instantiating a class that itself instantiates a class from the referenced library.
- I ran Process Monitor and just monitored the application path. I only get "PATH NOT FOUND" results for the source code file where the error occurs (compiled in debug mode so I assume this is just part of .NET trying to show the line where the error occurred when dumping the stack trace)
- This is running on a dedicated server in-house. The application is running on a .NET 3.5 application pool along with another web site built using the same referenced dll's. The other web site has a lot more traffic but never gets this error.
- The application is load-balanced across 3 web servers and all 3 get this issue at some point.
I turned on assembly binding logging on one of the web servers. Here is what the stack trace looks like:
System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.IO.FileLoadException: Could not load file or assembly 'Project.Library, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Access is denied.
File name: 'Project.Library, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
at ...
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Assembly manager loaded from: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorwks.dll
Running under executable c:\windows\system32\inetsrv\w3wp.exe
--- A detailed error log follows.
=== Pre-bind state information ===
LOG: User = Unknown
LOG: DisplayName = Project.Library, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
(Fully-specified)
LOG: Appbase = file:///C:/websites/ProjectPath/
LOG: Initial PrivatePath = C:\websites\ProjectPath\bin
Calling assembly : WebApp, Version=1.0.3723.37743, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\websites\ProjectPath\web.config
LOG: Using host configuration file: \\?\c:\windows\microsoft.net\framework\v2.0.50727\aspnet.config
LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/Temporary ASP.NET Files/root/d77c161e/8751390/Project.Library.DLL.
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/Temporary ASP.NET Files/root/d77c161e/8751390/Project.Library/Project.Library.DLL.
LOG: Attempting download of new URL file:///C:/websites/ProjectPath/bin/Project.Library.DLL.
ERR: Failed to complete setup of assembly (hr = 0x80070005). Probing terminated.
--- End of inner exception stack trace ---
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at ASP.myaccount_home_aspx.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
I'm not very familiar with debugging file load exceptions, so any help is greatly appreciated (what else I can do to debug, etc.).
Thanks.