Could not load file or assembly or one of its dependencies Access is denied The issue is random but after it happens once it continues

Question

I have found plenty of information out there about this error   ERROR  Could not load file or assembly    dll  or one of its dependencies  Access is denied      But i haven t found answer specific to my scenario   My site is deploy on 6 different production servers  only on one server i am facing this issue  The issue is random  but after it happens once  it continues until the site is recompile by done a small modification in web config file i know trick  after modification in web config recompile the web application  and site on that server start working  Yesterday  issue was reproducing after one month period of working  We can t afford this issue on production  Issue detail      Server Error in     Application                                                   Could not load file or assembly  MainCore DbImpl  Version 0 0 0 0  Culture neutral  PublicKeyToken null  or one of its dependencies  Access is denied        Description  An unhandled exception occurred during the execution of the current web request  Please review the stack trace for more information about the error and where it originated in the code        Exception Details  System IO FileLoadException  Could not load file or assembly  MainCore DbImpl  Version 0 0 0 0  Culture neutral  PublicKeyToken null  or one of its dependencies  Access is denied       Source Error        An unhandled exception was generated during the execution of the current web request  Information regarding the origin and location of the exception can be identified using the exception stack trace below       Assembly Load Trace  The following information can be helpful to determine why the assembly  MainCore DbImpl  Version 0 0 0 0  Culture neutral  PublicKeyToken null  could not be loaded       WRN  Assembly binding logging is turned OFF        To enable assembly bind failure logging  set the registry value  HKLM Software Microsoft Fusion EnableLog   DWORD  to 1        Note  There is some performance penalty associated with assembly bind failure logging        To turn this feature off  remove the registry value  HKLM Software Microsoft Fusion EnableLog        Stack Trace        FileLoadException  Could not load file or assembly  MainCore DbImpl  Version 0 0 0 0  Culture neutral  PublicKeyToken null  or one of its dependencies  Access is denied               DbImpl Event TTCEventController GetEventFields Int32 eventId   0          WebSuite SportChannel ModelImpl TTCModelController AddEventFieldList XmlElement eventNode  ITTCEventController ctrl  Int32 eventId  PlayerType stupidType  in    root SportChannel ModelImpl Ttc TTCModelController cs 171          ModelImpl TTCModelController GetLatestFourTourSchedulesXml   in    root SportChannel ModelImpl Ttc TTCModelController cs 283             WebRoot UserControls HeadlinesTab Page Load Object sender  EventArgs e   491          System Web Util CalliHelper EventArgFunctionCaller IntPtr fp  Object o  Object t  EventArgs e   25          System Web Util CalliEventHandlerDelegateProxy Callback Object sender  EventArgs e   42          System EventHandler Invoke Object sender  EventArgs e   0          System Web UI Control OnLoad EventArgs e   132          System Web UI Control LoadRecursive    66          System Web UI Control LoadRecursive    191          System Web UI Control LoadRecursive    191          System Web UI Page ProcessRequestMain Boolean includeStagesBeforeAsyncPoint  Boolean includeStagesAfterAsyncPoint   2428                                                 Version Information  Microsoft  NET Framework Version 2 0 50727 5446  ASP NET Version 2 0 50727 5420

User · Answer

In my case it was due to the Access Protection feature of my anti-virus (McAfee). It was obviously blocking access to this file, as of such the error.

I disabled it and the solution ran. You might want to check any utility application you might have running that could be affecting access to some files.

User · Answer

If you get the DLL could not be found instead of access denied  make sure you have the appropriate VC   Redistributable installed

User · Answer

For me  the following hack worked  Go to IIS -  Application Pools -  Advance Settings -  Process Model -  Identity Changed from Built-in Account  ApplicationPoolIdentity  to Custom Account  My Domain User

User · Answer

I had the same issue  fixed by rebuild and redeploy ALL Dependents Dll files

User · Answer

In my case  I had copied a service from one server to another without performing a proper deployment from Visual Studio   Long story   Anyway  I had setup all of the appropriate NTFS permissions and whatnot  but it still couldn t load the main DLL for the service   I fixed it by renaming the corresponding service pdb file to something else   For example here s my bin folder        bin          service dll         service dll config         service pdb  I renamed service pdb to zzservice pdb  and then the service dll loaded fine

User · Answer

I ran into this problem and it turned out that a referenced package assembly was being encrypted by Windows  This happened because my company implemented a policy to require the My Documents folder to be encrypted and my Visual Studio solutions happened to be under that directory    I could manually go into the file directory properties in Windows Explorer and disable encryption  But in my case this was a temporary solution since the network policy would eventually change it back  I wound up moving my VS solution to another un-encrypted location

User · Answer

I was not using impersonation in my case  My solution was to give full access to my project directory for the user group  IIS IUSRS

User · Answer

I am setting-up environment on new server  My web config got identity node like below When I faced with  Could not load file or assembly or one of its dependencies  Access is denied  The issue is random  but after it happens once  it continues   Added ccs HJKWeb as users list of my new server      lt authentication mode  Windows    gt           lt identity impersonate  true  password          userName  ccs HJKWeb    gt

User · Answer

Go to IIS -  Application Pool -  Advance Settings -  Enable 32-bit Applications

User · Answer

My solution is as follows    I didn t find a root folder under C  Windows Microsoft NET Framework v2 0 50727 Temporary ASP NET Files    Google told me that it might be a permission issue against current user  then I found I have a current Identity  IIS APPPOOL in the malfunctioning server where the rest of the server has Current Identity  NT AUTHORITY NETWORK SERVICE    Then I changed Current Identity from  IIS APPPOOL to NT AUTHORITY NETWORK SERVICE    From here  I found that resetting the web app rebuilds the temporary ASP NET cache  solving the issue

User · Answer

Go to run    ctrl   R  Type    temp            delete All files  amp  folders       Rebuild Project   done

User · Answer

In my case  I was using simple impersonation and the impersonation user had trouble accessing one of the project assemblies  My solution    Look for the message of the inner exception to identify the problematic assembly   Modify the security properties of the assembly file    a  Add the user account you re using for impersonation to the Group and user        names   b  Give that user account full access to the assembly file

User · Answer

Check the IIS settings   I use IIS 7 5 with 32 or 64 bit compilation within the  NET framework   If you have an app that uses 32-bit mode  make sure to enable the App Pool to be able to use 32-bit instruction   Otherwise  nothing seems to work no matter how much you set the security or strong sign the DLL

User · Answer

If you are using impersonation  be sure to give permissions  including write and modify permission to the relevant user account on the following folder   C  Users  username  AppData Local Temp Temporary ASP NET Files   I was missing the modify permission  which was why just adding the default permissions wasn t working for me

User · Answer

I believe I wasted like 1 day on researching it and this what I have come out with   You need to add the Impersonating user to the Debug folder of your Solution as the Framework will try to access the DLL from this location and place it in Temporary Asp Net Folder   So basically follow these 2 steps   Give permission to Temporary Asp Net Folder under C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files and make sure the user you are adding here is the same you are using while Impersonating  Add the Impersonating user to the Debug folder of your Solution YourSolutionPath     bin Debug   This should work

User · Answer

If you still facing the issue try this   Open your IIS Manager -  Application Pools -  select your app pool -  Advance Setting -  Under  Process Model  set  Load User Profile  setting as True

User · Answer

For my scenario  I found that there was a identity node in the web config file    lt identity impersonate  true  userName  blah  password  blah  gt    When I removed the userName and password parameters from node  it started working     Another option might be that you need to make sure that the specified userName has access to work with those  Temporary ASP NET Files  folders found in the various C  Windows Microsoft NET Framework version  folders   Hoping this helps someone else out

User · Answer

To anyone else who tried most of the solutions and still having problems    My solution is different from the others  which is located at the bottom of this post  but before you try it make sure you have exhausted the following lists  To be sure  I have tried all of them but to no avail    Recompile and redeploy from scratch  don t update the existing app  SO Answer Grant IIS IUSRS full access to the directory  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files    Keep in mind the framework version you are using  If your app is using impersonation  use that identity instead of IIS IUSRS Delete all contents of the directory  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files     Keep in mind the framework version you are using Change the identity of the AppPool that your app is using  from ApplicatonPoolIdentity to NetworkService    IIS   Application Pools   Select current app pool   Advance Settings   Identity   SO Answer  please restore to default if it doesn t work  Verify IIS Version and AppPool  NET version compatibility with your app  Highly applicable to first time deployments  SO Answer Verify impersonation configuration if applicable  SO Answer   My Solution   I found out that certain anti-virus softwares are actively blocking compilations of DLLs within the directory  Temporary ASP NET Files   mine was McAfee  the IT people failed to notify me of the installation   As per advice by both McAfee experts and Microsoft  you need to exclude the directory  Temporary ASP NET Files  in the real time scanning    Sources    McAfee Support Forum Microsoft Support Asp Net Forum   Don t disable the Anti-Virus because it is only doing its job  Don t manually copy missing DLL files in the directory  Temporary ASP NET Files project name  because thats duct taping

User · Answer

I got this error running from VS  Turned out I d opened a solution without running Visual Studio as admin  Closing Visual studio down and running it again as admin then rebuilding solved this for me   Hope that helps someone

User · Answer

Had the same issue  fixed with setting the parameter  Enable 32-bit applications  to  true   in advanced settings of iis application pool

[asp.net] Could not load file or assembly or one of its dependencies. Access is denied. The issue is random, but after it happens once, it continues

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