Nagios. Highly Regarded.

Award-winning monitoring software.

Nagios is trusted by thousands of organizations worldwide for mission-critical IT infrastructure monitoring. Your fellow IT professionals speak highly of Nagios.

Nagios Heroes Made Daily.

IT professionals worldwide love Nagios because it not only makes their job easier – it makes them into an IT hero. When you can fix problems before anyone notices, spot trends to aid future infrastructure upgrades, and provide management with much-needed capacity planning information, become a hero.

This ticket can be closed. I'd like to point out that Nagios support is the best I've encountered! And, I've been doing IT for a dozen years.
Nagios XI Customer
Services disappeared. Wow, we were in a panic mode to say the least. Mike recognized the urgency and contacted Nick from the Support team. Nick went above and beyond, and brought our system back from the “dead”. We truly appreciate your product but it is moment like this that we valued and it shows that you care.
Nagios XI Customer
Thank you everyone, especially Mike from Sales and Nick Scott, for your help in getting our XI monitoring system back up and running. About an hour before our big demonstration all of our pre-configured Hosts and Services
Nagios XI Customer
Thanks Andy. You have been great help. After working and creating so many tickets, I can say NAGIOS SUPPORT IS AWESOME.
Nagios XI Customer
Thumbs up to the team at Nagios. Best support I've encountered in 20 years of being in the IT game.
Nagios XI Customer
Really loving the very active nature of the support forum. A real blessing from God.
Nagios XI Customer
I know that this forum is for reporting issues, but I just wanted to take the time to say thanks for the phenomenal support and work you guys do. I was REALLY concerned when I was told that nagios support is forum based, but you guys have always responded to my issues with awesome results for me. Thanks you guys and make your boss get you a round of , you deserve it.
Nagios XI Customer
Nagios is an integral part of our infrastructure. By notifying us immediately of a service outage, we are able to rectify the issue before our customers and end users experience any problems.
Jared Bird Network Security Administrator, Sunrise Community Banks
With Nagios we were able to consolidate multiple commercial monitoring solutions into one, and at the same time reduce our maintenance costs.
Michael Niedermann Manager IT Infrastructure Operations, Sunrise Communications AG
Nagios helps our organization know about outages on our customers' network before they pick up the phone
Owner NRS Small Business Solutions
I LOVE this software. It lets my 3-man IS dept. manage 12 office and actually be proactive!
I.S. Directory Genesis Group
Nagios is a great monitoring system and working with it is one of the best parts of my job
Tamara Funk UNIX System Administrator, NTELOS
I love this program
IT Manager Mary Kay
Nagios allows us to be proactive to client problems
Owner GCS Tech
Unbeatable, proactive monitoring system
Euroweb Internet
Thanks for creating a great piece of software
Network Technician, MCI
An excellent stable, useful, user friendly, easy to setup NMS
Manager Network Operations National Informatics Centre
You can't pay for a better monitoring solution
Network Administrator Stock Yards Bank and Trust
It alerted us many times before the users event suspected there was an issue
Unix Admin TechMentors
Great product - we are big Nagios fans
Director of Technology Operations Evergreen Investments
Best monitoring tool by far
System Administrator 20:20 Logistics
Nagios Rocks!
System Administrator LIPSI
Nagios rocks for flexibility
Nagios rocks for flexibilityPrincipal and Security Engineer M5 Hosting
We're using Nagios to monitor everything in our network...Nagios rocks
Technical Operations Cablesurf
Great tool to customize your monitoring
System Engineer Jetair
This is a great tool that is very powerful
WAN Technician Stafford County Public Schools
Nagios is great software...I wouldn't use any other monitoring suite
Systems Administrator Santa Fe Institute
Superb product. We checked out the rest, but this is the best
Stabilys Ltd
Excellent tool. Has averted several problems before they were noticed by our customers
Network Security Specialist WorldCom Australia
We use this very reliable tool to monitor some critical services of our network
Associate System Administrator Samsung Electronics Co., Russia
Nagios Rocks!
Sr. Systems Admin Idealab!
Nagios is brilliant due to its modular design and simplicity
Operational Manager IT=it
Nagios finally gives us the troubleshooting we need to avoid getting calls about unrelated issues
Systems Engineer Internet49
Great piece of software which has proven to be far more useful than anything we have seen in the commercial sector
Network Engineer ALBACOMP
Nagios is one of the most powerful open-source tool I've found for network monitoring
Managing Director Imperitas Group
Great application, real life saver
Systems Administrator Virginia Bioinformatics Institute
Best network monitoring product I have ever worked with
Network Administrator Paper Converting Machine Company
Nagios has been monitoring our systems for the last couple of years and the amount of flexibility that it has given us is amazing
Systems Administrator Gulf Research Center
Nagios is a fantastic system. It provides us the ability to provide a more proactive approach.
Consultant Waytime Technologies
Nagios is a lifesaver
CTO PT Internet
Nagios rocks
Directory of Network Engineering Wheat International Communications
Nagios rocks. We've been using it in production...and it has definitely allows us to get a better look at things as well as be much more proactive to network issues.
Nagios has really given me the ability to be proactive with my network, computers, and applications
Systems Administrator NIC USA
Best monitoring tool I've ever seen!
System Administrator University Klagenfurt
Hi Shamas, BTW Nagios proved its worth last night; part of our infrastructure outside of the main ‘production’ data center got hit by a power spike last night; which meant that one of the development teams in Sweden no longer had a server to build on; which meant a possible 12 hour delay before someone even noticed. Nagios noticed within a minute and we could get someone over to the building to flip a few circuit breakers. Then this morning part of one of our VM clusters died during a sw upgrade. We noticed even before IT did – and now I’m working through the list of impacted systems to verify that they all came back cleanly. All in all a good day.
Nagios XI Customer
I am happy to say I am back on track for the proof of concept. I initially started out with the install of R2.0 and discovered an install bug. This prompted a fix by your team and the release of R2.1. When I went to install 2.1, I most likely did not have a clean system. The last response of Ludmil made me connect the dots of not having a clean install. I proceeded to remove NagiosXI from the server as well as cleaning the data out of the DB's. I was able to run the install and configure the system without issues. I am seeing all of the hosts in the dashboard. Thanks again for your help and the Nagios support team. I am excited to start working with XI and presenting a final product to our team for production use. The quick response by your team also demonstrated the type of support we can expect as an enterprise customer. That also helps a lot.
Nagios XI Customer
My experience with Nagios started back in 1999 when it was called Netsaint. I was working for a managed services company that only handled K-12 schools. We would help schools with their networking and server infrastructure including porn filtering. A co-worker had setup an instance of BigBrother but we needed something more reliable and a little more customizable. I believe NetSaint 0.0.4 was the first version we used to monitor roughly 30 servers at school corporations across Northern Indiana. I changed jobs around Jan 2006 to begin working at a local wireless ISP. They were using "Enterprise Monitor" at the time. After some quick demonstration we switched over to using Nagios to monitor somewhere around 400 devices on the network. After a couple acquisitions I am still with the company and now our Nagios installation monitors 2,677 hosts and 8,872 services with an average check latency of 0.001 seconds. Over the years we have written over 20 custom check plugins for some specialized equipment. We have continually acquired other companies that have other monitoring solutions such as Whats Up Gold, MikroTik The Dude and some other lesser known monitoring systems. Every time we turn down these other systems and import their data into Nagios. We use Nagios to drive so much more than monitoring. We use mk_livestatus with Nagios to feed our configuration backup system a list of network devices it needs to back up. We also use Nagios, mk_livestatus and Google Maps to provide us with a status map with one pin per each of our 475 cell sites that we have in our network. For alerting we are using an SMS modem with smstools to send text messages directly to cell phones so we get alerts even if the Nagios server is disconnected from the network. Through that SMS modem we can even send SMS commands to Nagios to acknowledge alerts or disable alerts entirely in the event we forget to set scheduled downtime when working at the data center. For us, Nagios isn't just a monitoring system. It's a critical tool helping to drive our entire infrastructure.
K-12 Schools Admin
Our unique environment was causing the install to fail, which required us to make a lot of changes internally. Andy worked diligently and helped us address all of the issues we were experiencing during the install. After it was installed successfully, he worked with us to export our Nagios Core config files and copy them to the XI environment. We now have a working interface that is successfully checking our hosts/services. I couldn’t have asked for a more capable person to help us throughout this process. He is truly a Subject Matter Expert and proved this by working through so many complex issues. The phenomenal customer service we received is greatly appreciated!
Lockheed Martin, EBS