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Nagios – ndo2db not running

Nagios – ndo2db not running

Your Nagios server was shutoff unexpectedly and now you see the “database backend” with a red exclamation in the web GUI. The only thing you can do is try to start the process, but it comes back with ndo2db is not running. Fortunately, the fix is pretty simple. Feel free to copy/paste the commands to avoid typos. Just make sure you omit the ‘#’ on each command otherwise the command won’t run. Assuming you have already tried restarting the ndo2db…

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Why Net Neutrality Is Vital For Entrepreneurs

Why Net Neutrality Is Vital For Entrepreneurs

The battle over net neutrality rages on and it has far-reaching implications beyond the US. Anyone who knows or follows me knows I am a huge fan of net neutrality. I’m not saying it is the only way to protect the free and open internet, but 1) it is one of the easiest, 2) it’s all we have, and 3) simple generally leads to less loopholes. For what it is worth, this isn’t a political discussion and I don’t intend…

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Configuring Quad9 on pfSense

Configuring Quad9 on pfSense

Quad9 is a DNS platform that adds a layer of security. It does this via standard DNS queries/responses. Basically, if a machine on your network queries a known bad hostname, the Quad9 DNS server responds by stating that domain does not exist (NX DOMAIN or non-existent domain). If you would like a bit more info on Quad9 including some speed benchmarks against other DNS services, I would suggest an earlier article, Quad9 – First Thoughts & Benchmarks. This post is all…

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Quad9 – First Thoughts & Benchmarks

Quad9 – First Thoughts & Benchmarks

Changelog 29Nov2017 – Originally published 6Dec2017  – Provided download links to DNS Benchmark tool and associated ini file Quad9 is the collaboration of IBM X-Force, PCH, and Global Cyber Alliance. It provides a DNS platform that combines high performance with security by blocking known malicious domains. At the time of this writing, Quad9 was using 19 threat feeds. I’m not going to get into the marketing speak because quite frankly, enough folks cover that well enough. Quad9 Main Site New…

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Sending pfSense logs to the DShield project

Sending pfSense logs to the DShield project

Changelog 02June2017 – Originally published 28Nov2017  – Updated due to script changes What is DShield and why would I send them my logs? According to the SANS Internet Storm Center (ISC), “DShield provides a platform for users of firewalls to share intrusion information. DShield is a free and open service.” While DShield is often referred to generically as a “collaborative firewall log correlation system,” for all practical purposes, it is a bit of threat intelligence well before threat intelligence was…

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Testing SPF, DKIM, and DMARC

Testing SPF, DKIM, and DMARC

If you are interested in a step-by-step implementation of SPF, DKIM, and DMARC, there’s a post for that! It’s on this site as well and it will walk you through the entire process. https://www.linuxincluded.com/implementing-spf-dkim-and-dmarc/ Before you jump into testing SPF, DKIM, or DMARC, you need to verify where your authoritative DNS nameservers are. The easiest way to do this is by going to a Linux command line and performing a whois. # whois linuxincluded.com   Domain Name: LINUXINCLUDED.COM   Registry Domain ID: 1985890536_DOMAIN_COM-VRSN   Registrar WHOIS…

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Implementing SPF, DKIM, and DMARC

Implementing SPF, DKIM, and DMARC

If you made it here, you might not be interested in the why’s of implementing the holy trinity of anti-email spoofing. However, if you’re still uncertain whether you should or shouldn’t, just do it! With the guide below, you’ll see it isn’t all that difficult and when used together, they provide great benefits like brand protection, reducing a phishing attack vector, less chance of your legitimate marketing emails ending up in spam, etc. It also makes you and your domain a…

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Securing Open RDP Ports

Securing Open RDP Ports

Mr. Mackey says it best — Open RDP ports on the internet are bad… mmmmkay. When you are architecting an environment, you should avoid them like the plague. Even on an internal network, you should avoid them. Otherwise, you are just asking for problems at some point whether it is someone pounding away looking for a username/password combination or a remote vulnerability in the service. Compromised servers (via RDP) are mainstays for criminal jump points and some are even monetizing…

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Installing Nagios XI on CentOS 7

Installing Nagios XI on CentOS 7

First things first, why CentOS 7 instead of 6? Well, CentOS 6 has issues with Python updating because of yum. Yes, you can install a separate instance, but it’s not fun and it can break down the road. Second, why not use the OVA provided by Nagios? As of September 2017, the version of Python on the OVA is ancient — 2.6.6. And because yum is tied to it, you can’t update it or you need to install a separate…

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HL7 Data Interfaces in Medical Environments: Attacking and Defending the Achille’s Heel of Healthcare

HL7 Data Interfaces in Medical Environments: Attacking and Defending the Achille’s Heel of Healthcare

This security research paper is the second of two examining the HL7 messaging standard, which is arguably the most fundamental flaw in healthcare IT. HL7 is used extensively for system-to-system communications and is in nearly every healthcare facility worldwide. The first paper is an overview of what can be done with stolen medical data, what HL7 is, as well as potential dangers inherent to HL7. The second paper moves beyond theory and is an in-depth, technical discussion on ways to…

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