Category Archives: Network Technologies

Network Technologies

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

Posted in Admin, Network Technologies | Tagged | Leave a comment

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

Posted in Admin, Network Technologies | Tagged | Leave a comment

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

Posted in Network Technologies, Web Site Technologies | Tagged | Leave a comment

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

Posted in Admin, IT Operational Excellence, Network Technologies | Tagged | Leave a comment

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

Posted in Linux, Network Technologies, Raspberry Pi | Tagged , , , | Leave a comment

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

Posted in IT Operational Excellence, Network Technologies, Web Site Technologies | Leave a comment

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

Posted in Admin, Linux, Network Technologies, Raspberry Pi, Security, Web Site Technologies | Tagged | Leave a comment

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

Posted in Admin, Network Technologies | Tagged , | Leave a comment

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

Posted in Linux, Network Technologies, Raspberry Pi | Tagged , , , , , , | Leave a comment

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

Posted in Admin, DNS, Network Technologies, Security | Tagged , | Leave a comment