System.Net.Sockets.SocketException：'An existing connection was forcibly closed by the remote host' 使用 SharePoint Online 低信任身份验证

Question

我们正在使用 Oauth 在 Azure 中使用 SharePoint 在线验证我们的云服务 - https://docs.microsoft.com/en-us/sharepoint/dev/sp-add-ins/three-authorization-systems-for-sharepoint-add-ins#low-trust 我们收到此错误 - System.Net.Sockets.SocketException：'An existing connection was forcibly closed by the remote host'

尝试下面的 clientContext.ExecuteQuery() 代码时。

Microsoft.SharePoint.Client.User spUser = null;
            try
            {
                using (clientContext)
                {
                    if (clientContext != null)
                    {
                        spUser = clientContext.Web.CurrentUser;

                        clientContext.Load(spUser);
                        clientContext.ExecuteQuery();

                        return spUser.LoginName.Split('|')[2];
                    }
                }
                return string.Empty;//no context = no id
            }

知道这个问题可能是什么或如何解决这个问题吗？谢谢

Answer 1

所以添加这个解决了问题：

using System.Net;
using System.Security.Authentication;

在 clientContext.ExecuteQuery();

之前添加以下代码

const SslProtocols _Tls12 = (SslProtocols)0x00000C00;
            const SecurityProtocolType Tls12 = (SecurityProtocolType)_Tls12;
            ServicePointManager.SecurityProtocol = Tls12;

潜在的问题似乎是我们正在使用 .net framework 4.5，我们必须将其升级到最新版本才能消除此错误。

这里有更多解释- Unable to read data from the transport connection : An existing connection was forcibly closed by the remote host