Cpk | C&CZ News

CPK messages are initially sent to the CPK mailing list, you can (un)subscribe via this link. You can also follow the service interruption messages via RSS using the link in the title under the RSS icon. If the CPK takes more time to resolve, any updates are published on this website.

For RU wide service interruption see meldingen.ru.nl.

Service Interruptions

1407: NFS problems under investigation

When we moved the gateways of our networks from the old location to the new firewalls, we have received some complaints about NFS filesystems having slowness, longer delays or unavailability. In general NFS should never be a requirement for a clusternode job if you can avoid it, because this I/O is always much slower than local I/O from /scratch. We are investigating how we can optimise the network to resolve this issue, but we are hard pressed to know the exact cause of the problem....

1415: Clusternode maintenance day - February 6th 2026

Every half year we do clusternode maintenance, with at least a package ugprade and a reboot, but sometimes other maintenance can happen, such as changes in filesystems or network configurations. The upcoming date for this maintenance is February 6th, 2026 (Friday)

Resolved Reports

1246: Network interruption Huygens wing 4

Due to a faulty network switch, approx 40 network connections in Huygens wing 4 were temporarily unavailable. The switch has been replaced.

1245: Matlab license server down

This morning, the Matlab license server stopped, because yesterday an error had been made in the upgrade to version R2019a. After the error had been corrected, the license server was restarted, which resolved the problem.

1244: Poster printer "kamerbreed" broken

The poster printer has to be repaired, but we can’t easily fix it. We hope to have the printer operational again in the near future. In the meantime you might use the RU copyshop.

1243: No connections to Eduroam with science accounts

Due to a configuration fault in the Science radius server, many connections to Eduroam for users with a science account failed. It took two days of joint investigation by ISC and C&CZ to resolve this problem.

1242: No Eduroam end for deprecated systems (Windows XP, Android 4.1, ...)

On December 10, the support for the security protocol TLS v1 and v1.1 was discontinued within the Radboud Eduroam wireless network. From that moment on, all wireless clients such as laptops, smartphones, tablets and the like must use TLS version 1.2 or higher. Unfortunately, the outcome of this change was not as expected. After the change, there were more clients with connection problems than the number of clients using TLSv1. After a period of testing and research, the ISC decided around 12....

1240: SSH connections of older clients/servers

A configuration change was automatically put into production Tuesday morning which had been prepared the previous day on Ubuntu 14_04 LTS, Ubuntu 16_04 LTS and Ubuntu 18_04 LTS in order to increase the level of security of SSH connections within FNWI. The change had the side effect of crashing the SSH daemon on Ubuntu 12_04 LTS and preventing older SSH clients from connecting at all. Users are encouraged to update their SSH clients so that we can gradually increase the level of security again....

1241: Disk problem milton fileserver

One of the data-disks has a currupted file system. During the time slot menioned above, the server was unavailable. At the moment the server is running without the defective disk (milkun16). At the moment, we are trying to fix the disk.

1239: Host hardware of virtual machines broken

Last night the host for a number of vm’s (oscar) broke down. By using a replacement server (joule) this problem has been temporarily resolved. Tomorrow the machine will be repaired ans we will determine when the machines will be switched back.

1237: Network problem IMAP-mailserver because of error during update

While testing a possible update to the IMAP mailserver, an error made the mailserver unavailable for ca. fifteen minutes.

1238: Bug in new IMAP mailserver resolved

The new version of the IMAP mailserver software contained a bug in the handling of SSL connections, that led to connections being dropped and depending on the mailclient led to a mailserver that could hardly be used. This morning a patch for this bug has been installed.