I'm sorry but the link to the article you were reading rotted. If the link was to a blog site, then the linked blogger may have inadvertently or purposely deleted his article or as is often the case, the blog no longer exists.
But if this was a link to a news article, the idiots at the news site archived the post so that only paid subscribers can access the material. I have no problem with this, but they should at least have left a stub instead of a 404 - Page Not Found.
At least with a stub they can entice you to buy a subscription or something, but nooooo, they have to be complete goofy morons and kill the link entirely. When will they begin to understand how the Interwebisphere works?