I've been reading HN for couple of months now and I'm really happy with the news that people subit etc.
Also, I'm working in my own startup for around two years now and doing just fine :)
Recently I've sent a link to YCombinator's HN to all my friends and one of them (who works in multinational bank) replied to me with this:
IWSS Security Event
Access to the URL http://news.ycombinator.com/news is currently restricted because it belongs to the Company Prohibited Sites category group.