We are getting 403 in core webapi using certificate pfx

Question

we have hosted dotnet core api in iis. we are using certificate authentication in post method. we are getting 403 in postman.

Mohamed Azarudeen Z · Answer

Hi Raj try these trouble shooting steps whuch may help in narrowing down the issue If you are receiving a 403 Forbidden error when making a POST request to a .NET Core API hosted in IIS with certificate authentication, there are a few potential reasons for this issue. Here are some troubleshooting steps you can follow: 1. Verify the certificate configuration: - Ensure that the SSL certificate is properly installed and configured on the IIS server. - Check that the correct certificate is selected in the IIS site bindings. - Confirm that the certificate is valid and not expired. 2. Check the certificate permissions: - Ensure that the certificate has the necessary permissions for the application pool identity or the user running the IIS worker process to access it. - Grant read access to the private key of the certificate for the appropriate user or service account. 3. Verify the API endpoint and HTTP verb: - Double-check that you are using the correct URL for the API endpoint in Postman, including any necessary path and query parameters. - Confirm that the HTTP verb you are using (POST) is allowed for the specific endpoint. 4. Check authorization and authentication settings: - Confirm that the API endpoint or controller action is correctly configured to require the appropriate authentication and authorization. - Ensure that the certificate authentication middleware is properly configured in your .NET Core API project. - Check if any specific roles or claims are required for accessing the endpoint and ensure that the authenticated user has the necessary authorization. 5. Validate the certificate on the client-side: - If you are using a client application (such as Postman) to make the API request, verify that the client is sending the correct certificate during the SSL handshake. - Make sure that the client application is configured to use the correct certificate for authentication. 6. Check error logs and IIS logs: - Examine the error logs on the server and IIS logs to gather more information about the specific cause of the 403 Forbidden error. - Look for any additional details or error messages that may provide insights into the issue.