Make sure you add the DNS to your resolve.conf file...

As far as the challenge servers go, I do know which two you are talking about, and I never managed to get them, though I got pretty close on one of them according to the solutions I've seen. Those two seem to be pretty troublesome for most students I think. In the end, I got five of the seven final challenges, and got most of the extra mile stuff in the coursework...but not before my initial 30 days lab time ended. I opted to extend it for another 30 days, and I'm glad I did. Just having the extra practice in and of itself is worth the money in my opinion. The final challenges probably helped me out more than anything else on the exam, but I recommend leaving a little time to rewatch the videos, too. I took the test two weeks after my lab time ended, and I think that was a pretty good way to get in enough review while still having the material fresh on my mind.

Just got my OSCP over the weekend! I am on cloud freakin nine right now. What a wildly fun class. The only thing I have to say (and I hope the instructors aren't reading this) is that I found the exam to not be as difficult as people were letting on. As long as you relax and don't let yourself get overwhelmed (and provided you did the coursework), it should just be more of the same. A 24-hour test, and within 8 hours I had already passed. 

Good luck to everyone else who is taking or thinking about taking this fantastic course!

And if anyone is hiring in the Austin, TX area, let me know.