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Regarding Retiring WS-Trust authentication protocol for connecting to Dataverse

Hello ,

Hope You are doing well.
I am one of the developers working on Microsoft technologies.
I have a query about the WS-Trust authentication protocol which is going to be retired soon.
I am using below different approaches for the Dynamics CRM authentication.
Online Authentication
                var conn = new CrmServiceClient($@"AuthType=ClientSecret;url={organizationUri};ClientId={clientId};ClientSecret={clientSecret}");

                conn.OrganizationWebProxyClient.InnerChannel.OperationTimeout = new TimeSpan(0, Convert.ToInt16(ConfigurationManager.AppSettings["MDC_ServiceTimeOut"]), 0);
                return conn.OrganizationWebProxyClient != null ? conn.OrganizationWebProxyClient : (IOrganizationService)conn.OrganizationServiceProxy;

OnPremise Authentication
              String connstr = "authtype=Office365;Url=" + _OrganizationUri + ";Domain=" + _domain + ";Username=" + _userName + ";Password=" + _password + "";
              ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
              CrmServiceClient conn = new CrmServiceClient(connstr);
               if (conn.IsReady)
                    service = conn.OrganizationWebProxyClient != null ? (IOrganizationService)conn.OrganizationWebProxyClient : (IOrganizationService)conn.OrganizationServiceProxy;
So for the above, all two approaches do I need to make any changes?
Please guide me on this.
Your help would be really appreciated.
Awaiting Your positive reply.


I'm not sure why do you need proxy at all. I use the following code in my apps that works transparently for both Online and On-Prem:


var conn = new CrmServiceClient("Your Valid Connection String");

if (!conn.IsReady)
//handle the connection issue here

//use conn object here
Super User
Super User

MSFT published a page on just this topic to help guide you away from WSTrust and the OrganizationServiceProxy class. I think you'll find the answers you're looking for here.


Use of Office365 authentication with Microsoft Dataverse (Microsoft Dataverse) - Power Apps | Micros...

This works fine. I have only concern that how We can authenticate the user which is not on cloud and having port number with the organization URI. see below example URL


I am trying to to using oath type "Office365". but not getting succeeded. 

Please advice on this.

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