There are all sorts of anti-troll, anti-spam and anti-voting ring measures in HN. Two that I know of, having run into them:

If you get too many friends/new accounts to upvote a story that you've submitted, it'll assume that there's collusion and your story will get killed off the front page.

You can't submit a story with the word 'troll' in it (this probably applies to other words too).

In your case, it's possibly the words 'enterprise' and 'portal' in the title/URL. Based on what I can see from the link that you've posted, it may be right, ie. enterprise portal solutions are not usually HN fodder unless there's an interesting twist to them.