I try to access a SharePoint 2013 Server via C# CSOM.

The only thing I do is create the ClientContext, set the context.Credentials to my NetworkCredential, and ask for the Web Web web = context.Web;.

After context.ExecuteQuery(); I get an 401 Unauthorized Error/Exception.

After playing around (with another server used for testing) I realized, that the problem is not due to incorrect password or incorrect credentials or even incorrect access rights (I'm Admin), but because of the server itself.

I know for sure:

  • My Credentials work fine (I can login via Web Interface as well)
  • The problem is from the server, not from the client
  • On my test environment it works!

A small background info.

The System that gives me the error had an issue last week and went completely offline the whole last week. After a lot of time, the Admins got it back to work again.

I assume, that a feature or something on the system did not start properly after the issues, and that's why I can't access it via CSOM.

My question is:
What SharePoint Feature or other Service needs to run on a SharePoint Server, so you can access it via CSOM.

My source code:

.ServerCertificateValidationCallback +=
(sender, cert, chain, sslPolicyErrors) => true; //used for https to work properly

string spurl = "https://my.spserver.com/sites/mysite";
using (ClientContext context = new ClientContext(spurl))
    context.Credentials =  new NetworkCredential("username", "password", "domain");


        Web web = context.Web;

    catch (Exception e)
        Console.WriteLine("Exception: "+e.Message);



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