Dynamics 365 CE Plugin Exception: System.Security.SecurityException: That assembly does not allow partially trusted callers.

/ Prashant Maurya

Today I faced an in an existing plugin which was working earlier. During investigation, I found that this is caused by the “HttpUtility.UrlEncode(clientSecret)” as shown in below code snippet image

HTTPUtilitySecurityError

I found 2 ways to fix this issue

  1. User “System.Net.WebUtility.UrlEncode()” instead of “System.Web.HttpUtility.UrlEncode()”.
  2. Use “System.Uri.EscapeDataString() ” instead of “System.Web.HttpUtility.UrlEncode()”. as suggested in the this blog post by Nishant Rana.

Thanks-

2 thoughts on “Dynamics 365 CE Plugin Exception: System.Security.SecurityException: That assembly does not allow partially trusted callers.”

  2. Hi,

    Where can i access this so I can change it? I have a plugin giving me this error on debug and I need to know where to change it please.

    Thanks.

    Reply

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