PRTG Catches Network Issues Before They Cause Downtime
Threshold-based alerts flag problems early, so your team can act before users notice, not after.
Reactive troubleshooting usually means hearing about a problem from frustrated users, not your monitoring tool. PRTG sets threshold-based alerts across devices, servers and applications, notifying your team by email, SMS or push the moment a metric crosses a set limit. That means catching a failing disk or overloaded server before it becomes an outage and getting time back from firefighting. Start a free trial and set your first alerts today.
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...(http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html)
2) Internet connection.(your system should be connected to the internet when the script is running.)
How to use it?
1) Run the jar file.
2) Now copy & paste the url in the url textfield.(use ctrl+v to paste)
3) Select the site which you think that the webpage belongs from the drop down list.
4) Now click on the check Button. :P
5) Now after it shows you a popup that the site is safe or dangerous you can click on the clear button to use it again.
6) Click on help button to get a quick tutorial.