Videokonferenzsysteme (DFNconf & Cisco Telefonanlage)

To resolve the current issues, maintenance work will be performed today between 4:30 p.m. and 5:30 p.m. During this time, there will be a service interruption affecting most of the services at RWTH for approximately 10 minutes. Please take this last-minute announcement into account when planning your work.

The work has been completed, and the issue has been successfully resolved.

Even though most of the services are up and running again, the root cause of the problem has not been resolved. We are continuing to work behind the scenes to fix the issue. However, this also means that disruptions may still occur.

The work has been completed, and the issue has been successfully resolved.

Login via RWTH Single Sign-On (SSO) is currently disrupted. As a result, it is not possible to log in to any connected services.

There is currently a widespread disruption affecting, among other things, the SSO, though not limited to it. The root cause analysis is still underway.

Most of the services are currently up and running again. The analysis is ongoing. We cannot rule out the possibility of further outages.

Most of the services are up and running again. Please note, however, that the underlying issue has not yet been resolved, and disruptions may therefore continue to occur.

Explanation Following the Outage:
On June 22, 2026, starting at 9:00 a.m., there was a widespread outage affecting our services, which primarily impacted the RWTH Single Sign-On but was not limited to it. By around 12:00 p.m., the situation had largely stabilized, allowing users to log in via RWTH Single Sign-On again; however, other issues (e.g., with the IT Center ticket tool and RWTHmoodle) persisted. On the same day, between 4:30 p.m. and 5:00 p.m., the data center firewall was rebooted, which resolved the remaining issues. The disruption was caused by problems with the data center core switch. To ensure a lasting improvement in the situation, maintenance on the affected system was successfully carried out on June 30, 2026.

There may currently be issues logging in via RWTH Single Sign-On (SSO).
This is because a new certificate has been active in the metadata since 9:30 a.m. today.
The relevant department has been notified and is working with the system operators to resolve the issue.

We will be performing an upgrade of the Cisco Meeting Server today.
During this time, the server will have limited availability or may be unavailable.

Maintenance has been successfully completed.

The Cisco Meeting Server will be updated and the hardware renewed.
The Phone Conference service will not be available during the maintenance period.

Die Wartung wurde erfolgreich beendet.

This evening around 20:25 - 21:00 there was a performance low in the SSO service and was checked by the specialist department during this time. The problem has been solved and fast logins without waiting times are possible again.

Aufgrund von Linkflaps der Anbindung nach Frankfurt kommt es derzeit zu kurzen Unterbrechungen der Konnektivität. Es wird bereits an einer Lösung des Problems gearbeitet.

Erweiterung der Ticketqueues.

Nachdem das DFN-seitige Problem nachts wenig ausgeprägt auftrat, waren seit ca. 10:14 Uhr hochschulweit vorübergehende Qualitätseinschränkungen in der Außenanbindung bemerkbar (abbrechende Verbindungen usw.). Nach Diagnose zusammen mit dem DFN-Verein wurde das Routing gegen 10:55 Uhr manuell angepasst, so dass nun kein Datenverkehr mehr über die – immer noch selbsttätig zu- und abschaltende – Faserverbindung nach Frankfurt a.M. fließt.
Die Anbindung läuft nun stabil über Hannover, so dass der Faserdefekt für uns keine bemerkbaren Auswirkungen mehr hat.
(Zu einem späteren Zeitpunkt, nach Wiederherstellung einer stabilen Verbindung nach Frankfurt durch den DFN-Verein bzw. seine Auftragnehmer, werden wir das Routing über beide Faserwege wieder in Betrieb nehmen.)

Die Leitung nach Frankfurt ist seit 18:26 Uhr wieder im regulären Betrieb. Ein defekter Transceiver wurde auf der Gegenseite getauscht.

At the moment, single sign-on and multi-factor authentication are sporadically disrupted. We are already working on a solution and ask for your patience.