Ask HN: Upvote not working?

[devgutt]

Hello, I have just launched my startup here and some users reported me that they couldn't get upvoting my threat. Is this a bug or is there a limited time to upvote?

[t0]

Brand new accounts can't. You need a couple of karma points. Asking for upvotes or upvoting a certain person isn't really fair.

[wmf]

Sometimes people aren't allowed to vote to prevent gaming the system. There's nothing you can do about it.