Category Archives: Admin

Reverse upper and lower case letters

Posted on August 15, 2017 by john | 11 views

Intro I am a look-at-the-keyboard typist! I can’t count the number of times I’ve begun an email with CAPs lock on, and found a nice correspondence looking like this: hI aNDRES,   i RE-CREATED THE SCRIPT. … Tired of the … Continue reading →

Posted in Admin, Linux | Tagged | Leave a comment

Adding a swap file in Amazon AWS for CentOS

Posted on May 1, 2017 by john | 61 views

Intro I was running a new daemon on my server, factomd, to experiment with digital currency. It’s an old m1.small instance with only 1.7 GB of memory. The first few times I ran it it would 70000 or so blocks, … Continue reading →

Posted in Admin, CentOS, Digital Currency, Linux | Tagged , , | Leave a comment

Bluecoat ProxySG and DNS using edns seem incompatible

Posted on February 24, 2017 by john | 62 views

Intro Imagine your DNS server had this behaviour when queried using dig: $ dig drjohnstechtalk.com @146.201.145.30 ; <<>> DiG 9.9.2-P2 <<>> drjohnstechtalk.com @10.201.145.30 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: FORMERR, id: 48905 ;; flags: … Continue reading →

Posted in Admin, DNS, Network Technologies | Tagged , , | Leave a comment

Use Raspberry Pi to explore mDNS

Posted on February 14, 2017 by john | 98 views

Intro I am confounded by the Bonjour field on my d-Link DCS-931L IP webcam. I should be able to use it to see my desired hostname, but it doesn’t take. Why? The details Having a Raspberry Pi on the same … Continue reading →

Posted in Admin, Network Technologies, Raspberry Pi | Tagged , | 2 Comments

Tips for creating a PayPal Donate button for not-not-for-profits

Posted on February 7, 2017 by john | 47 views

Intro I am treating my blog as a public service, so I thought it would be appropriate to have a Donation link even though I have not incorporated as a 501c3 non-profit. Is it even possible? Can I keep my … Continue reading →

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What I’m working on now: saving $69 a year on my certificate costs: Lets Encrypt

Posted on December 6, 2016 by john | 86 views

Intro I recently turned off my GoDaddy web site certificate and implemented one that cost me nothing. This will save me $69 per year. I wrote up my experience in this article: Idea for free web server certificates: Let’s Encrypt … Continue reading →

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drjohnstechtalk now uses HTTP Strict Transport Security, HSTS

Posted on November 22, 2016 by john | 71 views

Intro I was reading about a kind of amazingly thorough exploit which could be done using a Raspberry Pi zero. Physical access is required, but the scope of what this guy has figured out and put together is really amazing. … Continue reading →

Posted in Admin, Apache, Network Technologies, Security | Tagged | Leave a comment

Powershell winrm client error explained

Posted on September 2, 2016 by john | 4,796 views

Intro This particular Powershell error I came across yesterday is not well explained in other forums. I present the error and the explanation though not necessarily the solution. The details I recently received my new PC running Windows 8.1. On … Continue reading →

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Who’s using the UK Ministry of Defence’s IP addresses?

Posted on August 10, 2016 by john | 990 views

Intro When I first came upon a spear phishing email a few months ago which originated from the UK’s Ministry of Defence I thought that was pretty queer. Like, how ironic that an invoice scam is coming from a Defense … Continue reading →

Posted in Admin, Network Technologies | Tagged | 3 Comments

IP address wall of shame

Posted on July 12, 2016 by john | 175 views

Intro It can be very time-consuming to report bad actors on the Internet. The results are unpredictable and I suppose in some cases the situation could be worsened. Out of general frustration, I’ve decided to publicly list the worst offenders. … Continue reading →

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