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- Adding a swap file in Amazon AWS for CentOS
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- SSL Interception: troubleshooting
- What I’m working on now: Poor man’s version of Speedtest.net
- White web page: maximizes your backlight with no invasion of privacy
- Bluecoat ProxySG and DNS using edns seem incompatible
- The latest on handling of SHA-1 certificates by the major browsers
- Use Raspberry Pi to explore mDNS
- A few thoughts on Universal Basic Income
- Tips for creating a PayPal Donate button for not-not-for-profits
- Switch home router to DD-WRT: FAIL
- Free DNS services
- What I’m working on now: saving $69 a year on my certificate costs
- The IT Detective agency: the case of the incompatible sftp client
- drjohnstechtalk now uses HTTP Strict Transport Security, HSTS
- Consumer tech: How to safely add steps to your Fitbit
- Roll your own dynamic DNS update service
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Category Archives: Admin
Adding a swap file in Amazon AWS for CentOS
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 factomd, io per second, iostat
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Bluecoat ProxySG and DNS using edns seem incompatible
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
Use Raspberry Pi to explore mDNS
Intro I am confounded by the Bonjour field on my d-Link DCS-931L IP webcam. I should be able to use it to se 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 avahi-discover, D-Link DCS-931L
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Tips for creating a PayPal Donate button for not-not-for-profits
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
What I’m working on now: saving $69 a year on my certificate costs
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
drjohnstechtalk now uses HTTP Strict Transport Security, HSTS
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
Powershell winrm client error explained
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
Posted in Admin, CentOS
Tagged Basic authentication, Exchange Online Protection, GPO, Kerberos, PowerShell, winrm client
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Who’s using the UK Ministry of Defence’s IP addresses?
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
IP address wall of shame
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
The IT Detective Agency: the case of the mysterious reset
Intro An F5 BigIP load balancer equipped with web application firewall worked for everyone, except one app used by one customer. What was going wrong? Packet trace I always do a packet trace when there is nothing else to go … Continue reading