Deploying website: 500 - Internal server error

Question

I am trying to deploy an ASP.NET application. I have deployed the site to IIS, but when visiting it with the browser, it shows me this:

Server Error

Answer 1

If you're using a custom HttpHandler (i.e., implementing IHttpModule), make sure you're inspecting calls to its Error method.

You could have your handler throw the actual HttpExceptions (which have a useful Message property) during local debugging like this:

    public void Error(object sender, EventArgs e)
    {
        if (!HttpContext.Current.Request.IsLocal)
            return;
        var ex = ((HttpApplication)sender).Server.GetLastError();
        if (ex.GetType() == typeof(HttpException))
            throw ex;
    }

Also make sure to inspect the Exception's InnerException.