I've been burned a few times by the Microsoft Loopback Adapter (MLA). It's a nice idea to have a loopback adapter, but it appears to me that when a program asks Windows for an adapter (pick an adapter, any adapter) Windows either provides the loopback adapter as the default, or when a program asks for a list of adapters, the MLA is the first adapter in the list.
So what? There is lots of software out there that once it finds a connected adapter, it stops looking for better adapters. Yeah, I know that isn't the fault of the MLA, but here's the effect:
Here are some programs that have failed after enabling the MLA:
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