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Home/ Questions/Q 6183073
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Editorial Team
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Editorial Team
Asked: May 24, 20262026-05-24T01:18:19+00:00 2026-05-24T01:18:19+00:00

I have a Rails API hosted in Heroku. I also have a .NET console

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I have a Rails API hosted in Heroku. I also have a .NET console client that issues HTTPRequests (POST) to it just fine. However, I have a Silverlight that needs to do the same, but I keep getting this error:

Code 4004
ManagedRuntimeError

Which apparently is related to crossdomain issues.

Does anybody know what I need to do to get this Silverlight app to work against my Rails API?

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  1. Editorial Team
    Editorial Team
    2026-05-24T01:18:22+00:00Added an answer on May 24, 2026 at 1:18 am

    Sounds like you need to add a crossdomain.xml and/or clientaccesspolicy.xml file to the root of your rails site. Add the domain from which you are requesting from with the silverlight app.

    Here is an MSDN article:
    http://msdn.microsoft.com/en-us/library/cc197955(v=vs.95).aspx

    See also this answer: Cross Domain security error in Silverlight?

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