If you're a regular reader of my contributions to this web site you'll know that I'm a big fan of PRTG. It's a software product that you install on a Windows machine (ideally a dedicated one, but it doesn't have to be), which then monitors your network and keeps a watch on all your other devices. It can monitor Windows PCs and servers, Linux machines, and just about everything else. It can even monitor specific applications.
In my case, I use PRTG to monitor of bunch of servers that I look after as part of my day job. As soon as one of them is running low on hard disk space or memory, or is running more slowly than normal, PRTG lets me know. It even keeps an eye on all my SSL web certificates, and warns me when I need to renew one of them.
A couple of years ago, PRTG was free if you only needed to monitor 10 things across your entire colllection of servers. Then they increased it to 30. Today the company announced that the limit for the freeware version was being raised to 100 sensors, which previously cost $440.
So if you have never tried this great app, now is the time to put it through its paces. See www.paessler.com for the download, which runs to a fairly hefty 150 MB. The program is malware-free according to Web of Trust and the virus scanner I use most often (the download is too large for VirusTotal).
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