Author Archives: john

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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Can you go from Terminal 1 to Terminal 2 in O’Hare without going through the security lines again?

Yes. Yes, at least if you walk. Not sure about other transportation options. Count on about 13 minutes for the walk. Not sure why this information is so hard to find… Sometimes you land at one terminal and have to … 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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F5 clustering tips

Intro I was having trouble with one of my new F5 clusters. I thought I’d be clever and add two new F5’s to the existing cluster, and then remove the old members when everything looked good. But the device groups … Continue reading

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Postfix Operational tips

Intro I’m trying out the system-supplied postfix on a SLES system. i had been using sendmail but there doesn’t seem to be any development on that software. Some commands I needed right away Well, right away I had thousands of … Continue reading

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Live stream to YouTube from a Raspberry Pi + webcam or USB microphone

Intro I’ve been looking at this off and on for awhile now. I finally made a breakthrough this week and started to generate some decent live streams on my Youtube channel, after a lot of misfires. Note this is applicable … Continue reading

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How to add private root CAs in SLES or Redhat

Intro From time-to-time I run my own PKI infrastructure, namely issuing my own certificates form my private root CA. I wanted this root CA to be recognized by Linux utilities running on Suse Linux (SLES), in particular, lftp, which I … Continue reading

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Fishcam using Raspberry Pi and some network tricks

Intro There are more articles about running a webcam using Raspberry Pi than Carter has pills. Why bother to create another? This one is unique insofar as I created a fishcam at a school with a restricted network. None of … Continue reading

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The IT Detective agency: Live hack caught, partially stopped

Intro In my years at cybersecurity I’ve been sufficiently removed from the action that I’ve rarely been involved in an actual case. Until last night. A friend, whom I’ll call Jute, got a formal complaint about one of his hosted … Continue reading

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Evaluation of WPI’s multiple camera coprocessor using Raspberry Pi

Intro There’s some good and some not-so-good about the new WPI-provided way to handle multiple video streams using a Raspebrry Pi. ELP Cameras problems I have bought many of these ELP cameras last year and this. I may be a … Continue reading

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