Introversion

I'm doing the LAN Mission for the Arunmore side, trying to hack into the ARC LAN, but... I'm stifled at the second hub. I've scanned, probed, and even spoofed everything I can, but it won't let me connect to it. I went from the router to the first hub, then made sure to unlock a lock system that was to the side, but from the lock I can't connect to the terminal before the problem hub. I can connect to it directly from the first hub, but not through the (unlocked) lock, even though the blue lines show that it connects. From that terminal, I put the password in just fine, but cannot connect to the next hub to continue!

Please help; I'm enjoying the game immensly but this issue is getting on my nerves.