CS0016: Could not write to output file 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\62d43c41\27d749ca\App_Code.7lodcznm.dll' – 'Access denied.'

• Could not write to output file: 'Access is denied. '

• Description

   
  After installation of CMN free busy connector when attempting to open the EWS or autodiscover website the following error is seen in the web browser:

  Could not write to output file 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\ews\08abe623\f97edc69\App_global.asax.6hb5q8sv.dll' -- 'Access is denied.

  Permissions to the c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET folder and they are correct. Also, uninstalled/re-installed CMN Free Busy and  .NET  Frameworkand  registered .NET Framework for IIS

• Cause

   
  Permissions issue

• Resolution

   
  Follow below steps:

  1- Right click the %Temp% folder (mine is C:\WINDOWS\Temp) and select Sharing and Security.

  2- Select the Sharing tab and Make sure that the folder is shared.

  3- Select the Security tab and take a look at the list of “Group or user names:”

  NETWORK SERVICE should be in the list. If it is not, click Add and type Network Service in the text box.

  Make sure NETWORK SERVICE have Full Control in the Permissions list. Click OK.

  4- Restart IIS (Run iisreset)

  5- If the machine doesn’t have NETWORK SERVICE or NETWORK SERVICES Group, look for “IIS_IUSRS” and apply same permissions.

• Additional Information

   
  If steps listed above does not fix the issue, apply permissions to everyone on the Windows system TEMP folders as a test.