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For RU wide service interruption see meldingen.ru.nl.
ILS wifi management notified us that they will upgrade the software of wireless access points, because security flaws have been addressed in the latest release. The maintenance ends on 2022-10-21 01:30. Source: meldingen.ru.nl
Some time ago, some Science users fell for a phishing mail, therefore their account could be misused by spammers to send mail through our mailservers. Therefore our mailservers ended up in blacklists yesterday evening. Some mails could therefore not be delivered to other servers, that mail was returned to the sender. This morning we removed the IP addresses of our servers from several blacklists, we think that the problems are resolved now.
ILS network management announced: Tuesday September 27 23:30 maintenance is carried out on the Eduroam wireless network in FNWI buildings a.o. In most cases connectivity will be interrupted for at least 30 and at most 60 minutes.
ILS network management announced: Friday September 23 18.30 – 22.30 network maintenance is carried out on the DMZ and SRV firewalls. Connectivity interruptions of 20 to 40 seconds are expected. In case of problems, interruptions of 5 to 10 minutes might occur.
A few campus-wide dips in the power supply made network and telephony unusable for about 15 minutes, except in server rooms where UPSs guarantee the power supply. Because 7 modules of desktop switches in Huygens/HFML/Felix had become defective, several hundred network outlets will only have worked again after the relevant switch module had been replaced.
Still unclear what the cause is, several links are strongly degraded. Update: A defective switch has been replaced.
RU/ILS network management will switch to new hardware. This will lead to a network interruption of at most 5 minutes.
This afternoon three coma nodes lost their network because of an incorrect network configuration. They must have shown intermittent network problems earlier. It took us some time to find out what caused this network problem, but when found, it was easy to fix.
During the regular change of DNSSEC keys that secure DNS traffic, an incorrect key was introduced in the external DNS of ru.nl for astro.ru.nl. This made astro.ru.nl disappear from the internet. This error was partly corrected 2022-05-02 at ca. 14:00 hours, but the automatic process used an not accepted encryption. It took ILS until 2022-05-22 to correct that by hand after we eventually noticed the error. Because the DNS answer that astro.ru.nl doesn’t exist may be cached for 24 hours, the problem was not completely over until 2022-05-13 13:00. The main problems for users were that mail from an @astro.ru.nl address bounced.
The network switch of the Coma cluster seems to be broken, all attached nodes are separated from the rest of the network. We’ll replace the switch a.s.a.p. and (let) analyze the problem after that.