News archive April 2021 - Koos van den Hout

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2021-04-14 Year 2038 is coming! 5 days ago
Interesting kernel message in Linux today:
[ 3906.977410] ext2 filesystem being mounted at /media/koos/disk supports timestamps until 2038 (0x7fffffff)
So that filesystem (and lots of others) will give issues in 2038. Things need work before that date!

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2021-04-12 Passend font voor bbs geschiedenis 1 week ago met VGA font Op artikelen op kwam ik een echt VT220 font tegen. Ik dacht gelijk aan het gebruiken van iets vergelijkbaars voor omdat dat natuurlijk eigenlijk in de VGA font stijl moet van de topdagen van de BBS geschiedenis.

Het kostte even zoeken naar het passende font, maar dat is er (vast een extractie uit een IBM VGA rom): Perfect DOS VGA 437 font en daarna wat aanpassingen aan de stylesheet, en nu is in de juiste stijl.

Update: Iets meer werk toch: ik wil momenteel dat om 'historische' redenen de verwijzing nog werkt maar wel de browser hint om te upgraden, zodat deze pagina met een oude browser te bezoeken is maar een recentere browser vanzelf https wil. De upgradehint ('upgrade-insecure-requests') zorgde er voor dat de http versie een font wilde laden vanaf de https versie en dat moest even aan de ontvangende kant toegestaan worden.

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2021-04-10 Cleanup of my gpg private key 1 week ago
I learned about changes in GPG needing some updates to private keys so I loaded the private key for 0x5BA9368BE6F334E4 in a backup keyring and tried to find out what needs to be done. The explanation at Fixing old SHA1-infested OpenPGP keys seems to have the important parts.

Make sure the preferences are set correctly (no SHA1) and do a 'clear' on the key. I took the chance to change the expiry date to something a bit more in the future, set the e-mail address that I now use as primary and updated the weblink to my homepage to

I also updated the details on PGP - Koos van den Hout so these can be verified.

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2021-04-08 Stopping with NTP servers at work 1 week ago
For almost 20 years I was involved with the running of NTP time servers at work. But the hardware aged and my job is no longer in systems administration and not in the department actually housing the timeservers.

So, time to stop doing it. The pool ntp server has been retracted, DNS names removed and soon I will make one final trip to shut down hardware one last time and remove it from racks. The end for and others.

I still run an NTP server at home which is available in the IPv6 NTP pool. That server also compared itself to one of the servers at work so it has been reconfigured. I added a few upstream servers and made sure all of them are reachable via IPv6.

The log of NTP service at was kept, here is the final version:
8 Apr 2021DNS names for ntp service at removed
2 Apr 2021Announcement posted to system administration mailing list that ntp service at will stop
24 Sep 2014A second stratum-1 ntp appliance is brought on-line,
28 Nov 2011Fixed the networking for stardate, the full time lab is up and running.
23 Nov 2011The antenna cable connectors are soldered on which results in a working setup after a few tries. Stardate is better at reporting the state of the power to the GPS antenna, but has no working network. Huygens has working network and serves time to metronoom.
22 Nov 2011The server is active at its new IP. Our own GPS reference doesn't work yet: we still need to solder the right connectors on the antenna cable. The server is added to the ntp pool and traffic starts to flow a few hours later.
15 Nov 2011The ntp servers are moved to their new location
14 Nov 2011The ntp servers are switched off
13 Nov 2011We retract at its current address from the pool because the serverroom will move physically, the ntp equipment will move to a different location and the IP will change to deal with the traffic better
18 Sep 2011Stats for, five years after withdrawing it from the ntp pool
19 Sep 2010Stats for, four years after withdrawing it from the ntp pool
4 Mar 2010The turkish adsl provider ttnet falls off the Internet for a few hours, traffic falls from 2000 packets/second to 100 packets/second in that time
22 Jan 2010We volunteer for the turkish part of the ntp pool. Traffic explodes, peaks over 5000 packets/second
18 Sep 2009Stats for, three years after withdrawing it from the ntp pool
28 Jul back at full speed in the ntp pool, firewall configuration fixed
15 Jul 2009rear doors of racks closed again
2 Jul 2009 10:00serverroom airco has problems with high temperatures (28-30 C), we open rear doors of racks which makes the temperature go down a bit in the racks but the airco still has hard work
Mar tuned down in the ntp pool to avoid firewall issue
18 Sep 2008Stats for, two years after withdrawing it from the ntp pool
17 Jan has a GPS reception failure, fixed with a software update
18 Sep 2007Stats for, a year after withdrawing it from the ntp pool
11 Mar 2007airco failure serverroom
5 Mar 2007all ntp servers moved to one rack close together for temperature stability
20 Jan 2007airco failure serverroom
9 Jan added as stratum-1
23 Dec 2006airco failure serverroom
29 Nov 2006powerfailure in our building
1 Nov takes over as and joins
~ 24 Oct 2006antenna cable to reconnected
~ 6 Oct 2006ntpd on stardate disabled: free running clock starts to differ too much from correct time
~ 25 Aug 2006antenna cable from disconnected because of building and recabling activities
1 Aug leaves
19 Aug joins
10 Jan set up as stratum-1 with GPS time reference

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2021-04-07 The NTP ham clock is ticking 1 week ago
esp32 based NTP ham clock on breadboard Recently the parts for the NTP ham clock I saw in the Electron magazine arrived: an ESP32 module and a TFT display. It took a bit before I had time to actually do something with them but recently I put the modules on breadboard and started making the needed connections. There are not a lot of those, only 8 wires need to be connected between the ESP32 microcontroller and the TFT display.

After some fiddling it worked and I managed to program it all with the settings I like, such as the right timezone rules for the Netherlands, 24 hour display on both clocks and it fetches the NTP time from the NTP server in the shed so it doesn't rely on outside connectivity.

Now to find a case for it and wire it neatly.

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2021-04-05 I participated in the EA RTTY contest 2021 2 weeks ago
RTTY Contest on websdr Last weekend was the EA RTTY Contest 2021 edition. I decided to participate because I appreciate the contests organized by the Unión de Radioaficionados Españoles.

Participation time was somewhat limited due to other things happening in the easter weekend. In the end I made 79 contacts and entered my log in the 'SINGLE ALL LOW POWER DX' category. As 'low power' is defined as 'below 100 watts' and my RF amplifier isn't working at the moment this is the fitting category.

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2021-04-04 New country in the logs: South Korea 2 weeks ago
Another case of having luck and being at the radio at the right time and frequency: I saw a few stations from South Korea show up in FT8. Tried making contact with more than one of them and the second or third station became stronger after a few minutes and with some trying the contact was made with HL5BLI.

It was a really short opening, five minutes later I saw no traces of stations from South Korea.

Update 2021-04-05: And the contact is confirmed on Logbook of the World too.

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IPv6 check

Running test...
, reachable as PGP encrypted e-mail preferred. PGP key 5BA9 368B E6F3 34E4 local copy PGP key 5BA9 368B E6F3 34E4 via keyservers

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