Pingdom is an uptime monitoring service that tracks the performance of your websites and alerts you when they’re down. Day and night, Pingdom will act as an internet watchdog by keeping an eye on your websites—both public and password-protected—FTP servers, and email servers, and notifying you via email, SMS, or Twitter when they have stopped working. Not only that, but the service keeps a record of these detected errors for the lifetime of your account, giving you the ability to view detailed reports about website downtime, response time and load time in an instant.
Get started with Pingdom by signing up for an account, inputting your website information and identifying how frequently you’d like Pingdom to check in on the status of your site. Select your preferred notification method, and then take a look at your first Pingdom report with uptime, response time, and performance test statistics. Once your Pingdom account has been set up, you can sit back and relax knowing your website’s performance is being monitored at all times. Not only will the service send you email or SMS alerts when your site is having issues, but it will also send daily, weekly, or monthly site performance statistics to your email account as well.
View your alert history in an instant on Pingdom’s control panel, and even make your uptime statistics available to readers with the use of a public report page. Not only do Pingdom’s reports list when a problem was detected, but they also detail the type of error, how long it lasted, and what could have triggered it, as well. In addition, Pingdom performs error analysis tests during every website outage, including checking the traceroutes,DNS lookups, and header response from the server—all in an effort to help you pinpoint what may have gone wrong. Pingdom’s excellent service and customer support make it a fantastic option for anyone looking for a better way to track the performance of their websites.
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Thanks for the mentioned.. I would also like to suggest http://100pulse.com – A Free Website Monitoring service, that monitors website’s availability, monitors, DNS servers, Ports… Gives you instant alerts via Email, SMS, RSS Feed and google gadget..