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Caleb Miller's avatar
Caleb Miller
Copper Contributor
Jan 06, 2020

400 Bad Request - Protocol Error when using GetSharePointOnlineAuthenticatedContextTenant

I am trying to create an app using CSOM in C# for a service account to upload reports to a site collection.

  • The account is a site collection admin
  • The account can be used through a browser to log in to the site collection and upload files through the UI

Using the very basic code snippet below, when I attempt to load the Web object after authenticating with the user name and SecureString password for the account, I receive a 400 Bad Request Error stating that there was a protocol error. 

 

I tried switching from the PnPAuthenticationManager to manually building SharePointOnlineCredentials with the same result.  Has something recently changed in the way SharePoint Online credentials are supposed to be built?  It's been a year or so since I have tried do things this way but I don't recall having this issue in the past with the same account and tenant.

 

using (context = authManager.GetSharePointOnlineAuthenticatedContextTenant(urlSiteCollection, user, pwd))
{
try
{
Web web = context.Web;
context.Load(web);
context.ExecuteQuery();  // <-- Exception is thrown here
}
catch (Exception ex)
{

}
}

1 Reply

  • Gunnar Örn Haraldsson's avatar
    Gunnar Örn Haraldsson
    Copper Contributor
    Jan 08, 2020

    Hi Caleb Miller

     

    I dont remember using this function you are using ....ContextTenant so I guess there is the problem.

     

    public static SecureString ToSecureString(this string Source)
    {
        if (string.IsNullOrWhiteSpace(Source))
            return null;
        else
        {
            SecureString Result = new SecureString();
            foreach (char c in Source.ToCharArray())
                Result.AppendChar(c);
            return Result;
        }
    }

    public ConnectAndDoStuff(){
        ClientContext context = new ClientContext("https://contoso.sharepoint.com/sites/doStuffSite");
        var pass = "MyPassword";
        var password = pass.ToSecureString();
        context.Credentials = new SharePointOnlineCredentials("user@contoso.com", password);

        var web = context.Web;
        context.Load(web);
        context.ExecuteQuery();
    }

     

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