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There is Sharepoint 2010 Document center site when i browse its throw unexpected error in browser when i restart IIS site works fine but again everyday morning site not working and i saw below errors

Application error when access /sites/93/default.aspx, Error=Could not load file or assembly 'Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. Either a required impersonation level was not provided, or the provided impersonation level is invalid. (Exception from HRESULT: 0x80070542) at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.Load(String assemblyString) at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. Either a required impersonation level was not provided, or the provided impersonation level is invalid. (Exception from HRESULT: 0x80070542)
at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.Load(String assemblyString) at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

there is permissions exists in wfe server

SPFarm or app pool have policy accesss.

locat security >> impersonate a client after authentification > add user

  • did you recently change the credentials of the farm user/ web application user? – Rishi Jagati Apr 1 '18 at 4:30
  • yes i changed the spfarm,application pool accounts password, site works everytime i restart IIS – adilahmed Apr 1 '18 at 14:29
  • try to update the application pool identity again, go to application pool then advanced setting and change the identity by retying the credentials, after that recycle the application pool. hope this will resolve your issue. – Rishi Jagati Apr 2 '18 at 5:04
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To troubleshoot the issue, check things below:

  1. Check if you have updated the password of the account in application pools in IIS.

  2. Start full user synchronization in user profile service application.

  3. Run SharePoint 2010 product configuration wizard.

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