Author Archives: john

Monitoring by Zabbix: a working document

Intro I panned Zabbix in this post: DIY monitoring. But I have compelling reasons to revisit it. I have to say it has matured, but there remain some very frustrating things about it, especially when compared with SiteScope (now owned … Continue reading

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Consumer tech: Samsung touchscreen not responsive

Intro This may be really obvious to some, but I did not realize until recently that you can adjust the touch screen sensitivity on a Samsung smartphone. Who knew? Why it matters I have a family member with a glass … Continue reading

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Getting GNU screen to work on Windows 10 for a productive terminal multiplex environment

Intro My jump server is getting old and they’re threatening to cut it off. A jump server is a server from which you launch CLI terminal sessions into your linux servers. Since my laptop has firewall access to all the … Continue reading

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Azure Cloud: can you swap public IP addresses on two VMs?

Intro I am just beginning to use Microsoft’s Azure cloud environment. Although I am inclined to be a fan of AWS, I haven’t looked at AWS networking for awhile, and the last time I did something I felt totally lost … Continue reading

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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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