WebRequest to WSUS resources

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.NET

Hello,

I'm trying to check accessibility to <wuserver>/clientwebservice/client.asmx. And when I got some error I want to show some helpful information to user like following:
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HTTP 403: 0x80190193 / 0x80244018 – typically caused by incorrect proxy client configuration; may also be caused by misconfigured SSL implementation or access

(this information I have found in msdn forum)

But I'm getting same HResult for almost all exceptions - 0x80131509. I'm getting this one for 404, 407, 403, 500 and go on. But when I saw WSUS agent logs - there are diff codes for diff errors.

How can I get diff code for some of those exceptions?