Category Archives: Web Site Technologies

Chiefly related to the technology behind publishing a web site.

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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F5 Big-IP: When your virtual server does not present your chain certificate

Intro While I was on vacation someone replaced a certificate which had expired on the F5 Big-IP load balancer. Maybe they were not quite as careful as I would like to hope I would have been. In any case, shortly … Continue reading

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How to test if a web site requires a client certificate

Intro I can not find a link on the Internet for this, yet I think some admins would appreciate a relatively simple test to know is this a web site which requires a client certificate to work? The errors generated … Continue reading

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The IT Detective Agency: Cisco Jabber Carriage Return problem fixed

Intro Cisco Jabber is a pretty good IM application. I’ve seen how it is a true productivity enhancer. But not so much when it doesn’t work right. The symptoms I hadn’t rebooted for awhile. I had a bunch of open … Continue reading

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Where is my IP without the aggressive ads

Intro To locate where any IP address is located – known as geoip – you can do a simple duckduckgo search and get an idea, but you may also get sucked into one of those sites that provides a service … Continue reading

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Pi-hole: it’s as easy as pi to get rid of your advertisements

Intro I learned about pi-hole from Bloomberg Businessweek of all places. Seems right up my alley – uses Raspberry Pi in your home to get rid of advertisements. Turns out it was too easy and I don’t have much to … Continue reading

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The IT Detective Agency: the vanishing certificate error

Intro I was confronted with a web site certificate error. A user was reluctant – correctly – to proceed to an internal web site because he saw a message to the effect: I tried it myself with IE and got … Continue reading

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A taste of the Instagram API

Intro I always want to know more about how things really work behind the scenes, so I was excited when I overheard talk about how one company uses the Instagram API to do some cool things. An API is an … Continue reading

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Open Notebook: How does Citrix printing work anyway

Intro I’m speaking of the old Citrix Receiver client. You launch that and that puts you in a Citrix ICA “jail.” I recently help a company move an app which had been a browser-based app to a browser within Citrix. … Continue reading

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