Thanks for your response. This code has worked flawlessly for many years, it is only over the past six months that we have seen these failures. 90+% of the time, this works as expected. When we see the failure, we do not receive an INVALID response. In fact, it appears we are receiving HTML content, such as "<title>404 - Not Found</title>", "<h1>404 - Not Found</h1>", etc. I'm not finding any documentation that would suggest such behavior.
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