Show all posts in 2014
2014-Oct-22 by Florian Staffort
After Heartbleed and Shellshock the next security vulnerability is eager to make 2014 one of the years for admins to remember. This one is called POODLE (Padding Oracle on Downloaded Legacy Encryption) and was found in SSL 3.0, an almost 18-year-old encryption technology that is only used in less than 1% of worldwide SSL traffic—but it's nonetheless still used on the server side to support old browsers like, for example, Internet Explorer 6.
2014-Oct-16 by Florian Staffort
Monitoring via Secure Shell (SSH) enables you to gather information not only from many Linux/Unix and Mac OS systems, but also from the host hardware of your virtualization solution. It is essential to keep a close eye on the host servers as they are the backbone of all your virtual machines. A failure or even unusual behavior could lead to unforeseeable damage and require hours of work that could easily have been prevented.
2014-Oct-10 by Florian Staffort
If you have read all previous articles of this blog series, you're already quite an expert on how to utilize the PRTG Mini Probe API for your monitoring needs. After providing you with the proof of concept for monitoring your Linux systems with the Python Mini Probe, we want to show you another area of application—a probe for monitoring Java applications using Java Management Extensions: the JMX Mini Probe.
2014-Oct- 9 by Andrea Flachmann
Last week has been crazy at the Paessler office – crazy empty. Everyone was on the road, all over the world. We had a team in New York, in London and in our hometown of Nuremberg. We are just dropping in for a second to tell you about these events because tomorrow we are gone again.
2014-Oct- 7 by Florian Staffort
The best way to monitor the traffic in your network depends on several factors. If you are the responsible administrator for a high traffic network which is equipped with a lot of Cisco devices, NetFlow is the ideal monitoring option. In flow monitoring, the router gathers bandwidth usage data (flows), aggregates these flows, and sends UDP packets with flow information back to PRTG Network Monitor.
The main advantage of NetFlow monitoring in comparison to packet sniffing is reduced CPU load on the PRTG core server system because of a smaller flow of data to PRTG compared to the monitored traffic due to sampling (optional) and pre-aggregation of traffic data.
NetFlow monitoring is a great way to keep an eye on your traffic, especially if you have limited resources and need to differentiate the bandwidth usage by IP addresses and/or network protocol.
2014-Sep-26 by Florian Staffort
Just when you're glad the last security crisis has been averted, the next one seems to lurk right around the corner. Be it the infamous OpenSSL Heartbleed Bug, or other vulnerabilities that led to data theft and attacks on the IT infrastructure – you have to be prepared. This week Ars Technica reported about yet another bug: The GNU Bourne Again Shell (Bash) is affected by a security vulnerability. The Bash command-line shell is used in many Linux, Unix, and also Mac operating systems.
2014-Sep-25 by Florian Staffort
The more Windows clients you are responsible for in your network, the more likely the chances that some of them fail the Windows update once in a while—even with a sound update concept. To identify systems which haven't been updated with the latest security patches and performance enhancements, PRTG Network Monitor provides a simple but effective method: the Windows Last Update sensor.
2014-Sep-18 by Florian Staffort
The "Sensor of the Week" articles are a neat way for you to discover new areas of applications for PRTG Network Monitor—even ones you might yet not have thought of. This time, even if you already know and use the QoS (Quality of Service) Round Trip sensor, we urge you to keep on reading as we present to you a great new way to monitor the quality of a network connection without using remote probes: the PRTG QoS Reflector (open source) for the QoS Round Trip sensor!
2014-Sep-16 by Florian Staffort
This fall technology enthusiasts meet in New York City to attend the Interop Conference & Expo. Also Paessler will be there to emerge themselves into this exciting world to get inspired and, more importantly, to inspire. Meet our team and find out how PRTG Network Monitor can help you keep your network running while obtaining all the data you need!
2014-Sep-11 by Florian Staffort
When it comes to monitoring Linux or Unix systems, PRTG Network Monitor offers various interesting possibilities: Use one of PRTG's sensors for Linux monitoring via SNMP (Simple Network Management Protocol), SSH (Secure Shell), or WBEM (Web-Based Enterprise Management). Especially the SSH Script sensor offers you real freedom in customizing your Linux monitoring: Just write a script which returns the desired data from your Linux system (for example, the validity of your SSL certificate used by an Apache instance, see screenshot below), and you can monitor all changes and detect issues before they become a problem.