Announcements

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 In case of failure of this website: scc.fail
Please note! To view all incidents, planned maintenance, or internal KIT notices at the SCC, you must be logged into the KIT intranet. If you are a KIT member, log into the KIT intranet via remote access (VPN).
Stand: 15.07.2026 06:43:57

Incidents

 2026-07-08 12:30

HPC: Disruption of all HPC services


DescriptionUpdate, July 14, 2026, 10:00 a.m.:
HoreKa is available again to all users.

Users of the individual HPC systems will be notified via the relevant mailing lists.

Due to a serious security vulnerability, all login nodes for all HPC systems at KIT have been disabled. Jobs in the queue continue to run.
Currently, the HPC systems cannot be used.
Affected usersHPC-Users
Exists since2026-07-08 12:30
 2026-05-14 19:00

Functionality in OWA may be limited


DescriptionMitigation for Exchange Server vulnerability (critical zero day exploit) causes issues. These restrictions are temporary until a regular security update is released.

- OWA Print Calendar functionality might not work. As a workaround copy the data or screenshot the calendar you want to print or use Outlook Desktop client.
- Inline images might not display correctly in the recipients OWA reading pane. As a workaround, send images as email attachments or use Outlook Desktop client.
- Published calendars might not work with error 500.
- OWA light https://support.microsoft.com/en-us/office/learn-more-about-the-light-version-of-outlook-2aec8c2d-da48-4707-ba37-c800e1c284cd) does not work properly. ==> Users are unable to switch back to standard version of OWA. We will make the necessary changes for all affected users on the server side.
Affected usersUsers using https://owa.kit.edu
Exists since2026-05-14 19:00

Maintenance

  2026-07-01 00:00 - 2026-08-31 23:59

M365: Microsoft is changing the authentication process for external users who access content shared via OneDrive or SharePoint Online


AFFECTED
M365–Organisation: "KIT - Karlsruhe Institute for Technology" (=employees’ home organisation)
  • SB: Microsoft OneDrive for Business - Tenant KIT0: "KIT - Karlsruhe Institute for Technology" (Heimatorganisation der Mitarbeitenden)
  • SB: Microsoft SharePoint Online - Tenant KIT0: "KIT - Karlsruhe Institute for Technology" (Heimatorganisation der Mitarbeitenden)

IMPACT No interruptions.

REASON
Configuration change

DESCRIPTION
Microsoft is changing the authentication method external users use to access content shared through OneDrive and SharePoint Online.

The previous SharePoint Online One-Time Passcode (OTP) method will be retired and replaced by Microsoft Entra B2B authentication.

What is changing?
Previously, external users could access shared content by signing in with a SharePoint Online One-Time Passcode (OTP) sent to their email address. Microsoft is moving this process to Microsoft Entra B2B.

Timeline:
  • Starting in July 2026, SharePoint Online One-Time Passcode (OTP) authentication will be gradually retired.
  • The transition is expected to be completed by August 31, 2026.

Impact on existing sharing links:
  • External users who already have a Microsoft Entra B2B guest account will not be affected by this change.
  • External users who do not yet have a Microsoft Entra B2B guest account may no longer be able to access content that was previously shared with them after the retirement begins in July 2026. In this case, an access denied message may appear.
  • To restore access, it is sufficient to re-share a file or folder with the affected user using the same email address. This creates the required guest account.
  • If an external user uses multiple sharing links, re-sharing a single item is sufficient. After that, all previously shared links for this user will work again.

Impact on new sharing links: New sharing links created after the transition will automatically use Microsoft Entra B2B authentication.

What do you need to do?
In most cases, no action is required. If an external user can no longer access shared content after July 2026, simply re-share a file or folder with the same external email address. After that, access to all previously shared content will be restored.
Stand: 15.07.2026 06:43:58

Announcements

 2026-07-10 12:41

DISCONTINUATION: 'OWA Light' is no longer available on OWA.kit.edu


DESCRIPTION
Discontinuation of 'OWA Light'
'OWA Light' is a deprecated experience for owa.kit.edu that can be enabled optionally.
( see OWA Light:' https://support.microsoft.com/en-us/outlook/learn-more-about-the-light-version-of-outlook )

AFFECTED
Users who use Outlook Web Access at KIT - https://owa.kit.edu
IMPACTS - The deactivation has no impact on the use of the KIT mailbox via https://owa.kit.edu
- All users who had enabled 'OWA Light' have already been switched to the standard version of OWA.
- In the future, it will no longer be possible to activate 'OWA Light'.
CAUSE
'OWA Light' has not been working since May 14, 2026, due to a mitigation measure.
( see fault report: https://www.scc.kit.edu/en/services/announcements.php#stoerung_aktuell_rahmen_161017 )

Microsoft has announced that the service will be retired and disabled, likely in August 2026.
( see retirement info: https://techcommunity.microsoft.com/blog/exchange/upcoming-retirement-of-owa-light-in-exchange-server/4534943 )

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