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How to change WS-Trust security in a project

My situation is that suddenly I get :Value cannot be null.Parameter name: service when trying to get organizationservice,after googling I found that my proj uses WS-Trust security and it might create my problems,

after reading about it in ms docs I found that this might be my case :

If you are accessing the CrmServiceClient.OrganizationServiceProxy property:

Remove all use of that property in your code. CrmServiceClient implements IOrganizationService and exposes everything that is settable for the organization service proxy.

My question is if I remove my use of :

CrmServiceClient crmServiceClient = new CrmServiceClient( connectionString);
IOrganizationService organizationService = (IOrganizationService)crmServiceClient.OrganizationWebProxyClient != null
? (IOrganizationService)crmServiceClient.OrganizationWebProxyClient : (IOrganizationService)crmServiceClient.OrganizationServiceProxy;

what could be the replacement ?

Does anyone deal with that case? Is there an other way to solve it ?

Hello Sahara,

Based on the documentation below the OrganizationServiceProxy has been deprecated:

https://docs.microsoft.com/en-us/power-platform/important-changes-coming#deprecation-of-office365-authentication-type-and-organizationserviceproxy-class-for-connecting-to-common-data-service

The reason why we deprecated it is because it was using WS-Trust.

In the document, you have more details about it.

Given the security concern the OrganizationServiceProxy and the way it has been initially implemented, I will kindly ask you to review the code and instead of using OrganizationServiceProxy, you can try to use CrmServiceClient.

More details about it are available in the article below:

https://docs.microsoft.com/en-us/dotnet/api/microsoft.xrm.tooling.connector.crmserviceclient?view=dynamics-xrmtooling-ce-9

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