C&CZ Problem Card

The configurations in the network switches in the buildings/floors/locations mentioned above, will be replaced. This means that both wired en wireless networks at these locations will be interrupted and network traffic will not be possible.

Due to a configuration fault in a C&CZ server switch it became unreachable. Therefore some servers and services were unreachable as well (nameserver, mail etc). After a quick fix the systems were up and running again.

Saturday morning, during maintenance by UVB and Liander, there were a few short unintended power dips in the Huygens building. A large part of the network switches does not have a UPS and thus restarted. After 09:11 all switches were operational again. Background: January 10 and 17, maintenance has been carried out on the power transformers in the Huygens building. This work should be carried out once every 5 years. Because a power failure of 6-8 hours (duration of maintenance) is unacceptable for the Faculty of Science, last year bypasses have been constructed, to make the transformers able to replace each other....

The license server still runs Ubuntu 10.04. This means that in a few months it would not receive security updates. Furthermore we want to use this server for DNS/DNSSEC/DHCP-service, which makes Ubuntu 14.04 necessary. Because this is a license server, we cannot switch to a new server, but we will place disks with the new OS in the existing server. Because this only means a small amount of downtime, users will hardly notice....

Resolved by a server reboot. Affected disks: acfiles beevee bioniccell bio-orgchem celbio1 celbio2 chemprac csgi-archief csg-projecten csg-staf desda ds ehef1 ehef2 ehef3 femtospin geminstr2 giphouse gissig gmi hfml-backup hfml-backup2 hfml-backup-inst highres impuls introcie isis janvanhest kaartenbak kangoeroe mathsolcie microbiology microbiology2 milkun2 milkun2RenD milkun3 milkun5 milkun6 milkun7 milkun7rw molbiol mwstudiereis neuroinf neuroinf2 olympus puc randomwalkmodel secres2 sigma sigmacies spectra spectra-rw spm spmdata3 spmdata4 spmdata5 spmdata6 spmdata7 spmstaff ssi staff-hfml stroom thalia ucm vsc vsc1 vsc10 vsc11 vsc12 vsc13 vsc14 vsc15 vsc2 vsc3 vsc4 vsc5 vsc6 vsc7 vsc8 vsc9 vscadmin wiskalg wiskunde wkru

There was again a problem with another harddisk of the IMAP server. This made the server unusable. A reboot solved the problem.

The IMAP server got overloaded again which could not be due to user usage. The server was rebooted since all I/O processing was stopped and we could not kill any processes. Snapshots have now been completely disabled. It took quite some time before the server had all disks and filesystems in working order.

There was a problem with a failed harddisk of the IMAP server. This slowed the machine down so that it was practically unusable. The problem was solved by replacing the disk.

As reported by the ISC, the RU was victim of a DDOS attack. As a consequence of this is the connection to the Internet was interrupted. Measures have been taken to prevent a similar attack having this result in the future.

The network switches in the buildings/floors/locations mentioned above will be replaced. This means that both wired en wireless networks at these locations will be interrupted and network traffic will not be possible. This includes the network for access control, climate control etc.