Oh hey Eric. I think I was wrong saying it was 1.1. It was a middlebox that ignored max fragment negotiation, which I think was introduced in 1.2. IIRC, the middlebox claimed to support it for 1.2 connections, but silently failed by blackholing the connection. They eventually crafted a fix, but it was an annoying year waiting for network operators to upgrade the firmware on their routers.