Random WSAECONNREFUSED on Windows Server 2012 / IIS 8.0

At our hosting provider, we have a server running Windows Server with IIS 8.0 through VMWare 2012. It hosts several web applications. In addition, FTP is running on port 21 on FileZilla Server. Since last August, apparently at random, the server sometimes refuses the connection on port 80 and 443 (WSAECONNREFUSED). He never refuses the connection on port 21. To give an illustration of how randomly, it is: it's happened to every day this week, but it never happened two weeks before. We cannot find anything in the IIS logging. The only thing we can find is that when you connect via port 80 (or 443), even on the server itself on 127.0.0.1, it usually works very well but sometimes WSAECONNREFUSED begins to appear between successful connections. Both, we and our host so far haven't a clue what is the cause, but other than that he's a suspect that it happens on the ports used by IIS, but IIS or the Windows event log will never make anything. Our hosting provider is a clone of this server on which we have disabled most of the web applications. This clone has the same behavior, even at the same time. A third server, which is entirely new (and running Windows Server R2 2012) does not show this behavior. All three are on the same network. After two months of research we have not still find something. Pointers are truly appreciated, as these errors are a problem for ourselves and for our clients.

Thank you.

This issue is beyond the scope of this site (for consumers) and to be sure, you get the best (and fastest) reply, we have to ask either on Technet (for IT Pro) or MSDN (for developers)
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