Rajeev Pentyala – Microsoft power platform blog

Other day , while accessing my WCF service (i.e., .svc) from IIS server, I was getting below error:

Reason:

• In my case, Issue is with missing ‘Write’ privilege for ‘Windows Authentication’ in IIS server.

Fix:

To fix the issue follow below steps

• Connect to your IIS server
• Select the ‘Server node’ (i.e., Your machine name) from left ‘Connections’ pane
• On the right ‘Features View’ pane, select ‘Feature Delegation’ option

• From the list, select ‘Authentication – Windows’ option and make sure the delegation set to ‘Read\Write’
  • If its only ‘Read’, click on ‘Read/Write’ link from right side ‘Set Feature Delegation’ pane.

• Restart your web app
• Try to browse the files and they should work now.

🙂