Author Archives: john

The IT Detective Agency: the case of the Is it the firewall? or routing? or switch? or layer 2?

Intro This is yet another tale of things in the IT world often do not turn out the way it seems at first blush. Or possibly a tale of just when you think you’ve seen it all after decades in … Continue reading

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The IT Detective Agency: WebEx and the case of the mysterious reset

Intro A company known to me was a contented user of WebEx until they noticed a strange behaviour: their calls were losing quality or even dropped exactly after one hour. No one, most especially the vendor of WebEx, had the … Continue reading

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What I’m Working on Now: building my own 3D printer

Intro Because someone else on the team had a good experience with it, and so i can exchange notes and get some tips form them, I went ahead and ordered the Anet A8 3D printer + an extra roll of … Continue reading

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The IT Detective Agency: the case of Failed to convert character

Intro A user of a web form noticed any password that includes an accented character is rejected. He came to use as the operator of the web application firewall for a fix. More details The web server was behind an … Continue reading

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How to POST with curl

Intro For the hard-core curl fans I find these examples useful. Example 1 Posting in-line form data, e.g., to an api: $ curl ‐d 'hi there' https://drjohns.com/api/example Well, that might work, but I normally add more switches. Example 2 $ … Continue reading

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No Internet, secure WiFi status message in Windows 10

Intro Finding out how Windows decides if there is an Internet connection or not can be a challenge often posed by trying to do an Internet search comprised or words that are common and therefore used in many other contexts. … Continue reading

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Raspberry Pi Recovery Mode or interrupting the boot process

Intro If you installed Raspbian from the NOOBS distribution as I do, then you may occasionally “blow up” your installation as I just have! You have an out, sort of, short of re-imaging the disk, though about with the same … Continue reading

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apache as reverse proxy under SLES

Intro Just got my SLES 12 SP4 server. That’s a type of commercial Linux I needed to set up a secure reverse proxy in a hurry. There’s a lot of suggestions out there. I share what worked for me. The … Continue reading

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Solution to NPR puzzle using Raspberry Pi

Intro Take a common five-letter word. If you add an “e” to the end you’ll get a common six-letter word. or add an ‘e” after the second letter to get a different six-letter word, or an “e” after the fourth … Continue reading

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Raspberry Pi photo frame using your pictures on your Google Drive

Intro All my spouse’s digital photo frames are either broken or nearly broken – probably she got them from garage sales. Regardless, they spend 99% of the the time black. Now, since I had bought that Raspberry Pi PiDisplay awhile … Continue reading

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