Sometimes there are websites which can only accept limited connection at a time.  For example, if a website can only accept 1000 connections and the 1001 connection will not be able to connect to the website.  As a result this will display HTTP error message.  

Monitor Websites can notify you when that site is up which will save time from refreshing.  It can also notify you when the site goes down.

Benefit free social media coverage & accelerate visibility with Search Engine Optimization.