Thank you for your participation. Armstrong and Ocelot have recovered.

Tohru Adachi

man of speen
The issue with the US machine was the connecting ports (27015, 27005, 27020) being taken by stray SRCDS processes, resulting in a reboot causing the actual server to rebind to another port or fail and crash if it had -strictportbind on its commandline (This was the case for the Parkour.TF servers which are also hosted off of US-1).
The OS of the host machine had to be reinstalled, which seems to have fixed the issue for now.