The most important thing is the stability of the site, if the site because of downtime and inaccessible, so for the site itself is a disaster, webmaster most important responsibility is to restore the first time after the server down, to prevent the site for a long time downtime caused more damage, therefore, Site administrators need a 24-hour uninterrupted monitoring of their site, once the situation is inaccessible, immediately notify the administrator via mail and short messages. Here I introduce some of the common free website downtime monitoring services.
Siteuptime-free users can monitor a website, monitoring every half hour, can monitor 4 ports, provide 4 monitor server for users to choose, the site can not visit when will send email to inform you. Siteuptime also provides free users with statistical reports, monthly report mails and other practical services.
Site 24x7-free users can detect up to 2 sites every 60 minutes. You can get alerts and reports for emails or text messages. New registered users can enjoy 15 days full function, and then automatically switch to free account. It is noteworthy that this website provides a Chinese language interface and does not understand the English recommended use of this website.
Webperform-Chinese version of the website monitoring service, free users can monitor up to two sites every 60 minutes.
Hosttracker-Free users monitor two sites every 30 minutes.
Website Nanny-China Webmaster Station launched the Monitoring Server online status of services, free users can monitor a server in 30 minutes, mail notification, toll users have SMS notification.