Here is the solution to the LAN in UHL Challenge 2

The First Isolation Bridge : Both locks are open, just go straight past it ;)

The Terminal String : Each terminal contains a number. Collect all teh numbers, put them together in the order you get them, and it gives you a phone number.

Small Isolation Bridge Puzzle : First activate the uppermost left bridge. Next to the one directly up from the HUB, and then the one to the left of the hub. This will allow you access to the terminal.

"Something very similar to this happened - Last time you tried". Are you thinking backwards enough? : Inspired by the somewhat famous 'Fox' puzzle. Convert the words into number, by the number of letters in each word inside the quotes, and put them together to get a phone number.

Large Isolation Bridge Puzzle : This puzzle is impossible. There is no way to do it, and if you do somehow manage to do it, there is nothing but a terminal telling you that you wasted your time. Its simple there to distract you.

(4121 / 26) + X : If you connected to the terminals at the start of the lan, you would have found one saying x = 5. Put x into that equation, work it out and it gives you a frequency, which conencts you to the main server.