The remote server returned an error: (403) Forbidden

Question

I\'ve written an app that has worked fine for months, in the last few days I\'ve been getting the error below on the installed version only.

If I run the source code

Answer 1

Add the following line:

request.UseDefaultCredentials = true;

This will let the application use the credentials of the logged in user to access the site. If it's returning 403, clearly it's expecting authentication.

It's also possible that you (now?) have an authenticating proxy in between you and the remote site. In which case, try:

request.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials;

Hope this helps.