For what it's worth, this sounds like a firewall configured to drop packets, but I wouldn't expect a firewall to apply to localhost connections.

So the earlier comment about how to measure throughput got me thinking, so I put together a throughput measurement tool. Blueprint here: https://gist.github.com/ComputerDruid/ef7d0a2698fa6d6e7afa2df6a365a116 Built out of a few combinators. It's set up to run on Iron plates, but changing the first co...