Category Archives: DNS

What if someone approaches you offering a domain?

Intro As a domain owner you will sooner or later get an unsolicited email like the following one I received March 28th: Hello,   We are promoting the sale of the domain name johnstechtalk.com that is being returned back to … Continue reading

Posted in DNS, Scams | Tagged , , , , | Leave a comment

The IT Detective Agency: since when can a powered off PC do dynamic DNS updates?

Intro The IT Detectives are back after a short lull during which no great mysteries needed expert resolution – you knew that situation couldn’t last too long. The following tale was relayed to me, I unfortunately cannot claim to have … Continue reading

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

Strange problem with email to paladinny.com

Intro This is probably the most obscure of all postings I will ever do – it’s really just opening up my private journal to the Internet, which helps me when I need to recall how I fixed something. So the … Continue reading

Posted in Admin, DNS, Internet Mail, SLES | Tagged | 1 Comment

The IT Detective Agency: can’t get email from one sender

Intro For this article to make any sense whatsoever you have to understand that I enforce SPF in my mail system, which I described in SPF – not all it’s cracked up to be. The details Well, some domain admins … Continue reading

Posted in Admin, DNS, Internet Mail | Tagged , | Leave a comment

The IT Detective Agency: is the guy rebooting our Linux server from France?

Intro Sometimes you get a case that turns out to be silly and puts a smile on your face. This one is hardly worth the effort to write it up, but as I want to portray the life of an … Continue reading

Posted in Admin, DNS | Tagged , , , | Leave a comment

The IT Detective Agency: Roku player can’t connect to Internet

Intro I bought a used Roku player, just to try it out. Things didn’t go right at first. The details Setting it up, I got to the point where it tests its Internet connection. There are three status lights. The … Continue reading

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

“FBI’s” DNS Severs – Trying to Clear Some of the Hysteria

Intro This Fox News article about infected computers was brought to my attention: Hundreds of thousands may lose Internet in July Hey, their URLs look like my URLs. Wonder if they’re using WordPress. But I digress. I was asked if … Continue reading

Posted in DNS | Tagged | 3 Comments

The IT Detective Agency: Browsing Stopped Working on Internet-Connected Enterprise Laptops

Intro Recall our elegant solution to DNS clobbering and use of a PAC file, which we documented here: The IT Detective Agency: How We Neutralized Nasty DNS Clobbering Before it Could Bite Us. Things were going smoothly with that kludge … Continue reading

Posted in Admin, DNS, Proxy | Tagged | Leave a comment

The IT Detective Agency: How We Neutralized Nasty DNS Clobbering Before it Could Bite Us

This gets a little involved. But if you’re the IT expert called on to fix something, you better be able to roll up your sleeves and figure it out! In this article, I described how some, but not all ISPs … Continue reading

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

DNS Clobbering – How ISPs Twist DNS Replies

Intro Some ISPs have taken advantage of missing or broken DNS records, using them as an excuse to guide users to their own pages. From an Internet purist’s point-of-view this is bad behavior. I call it DNS clobbering. In my … Continue reading

Posted in DNS, IT Operational Excellence | Tagged | 2 Comments