Störungsverlauf von Hornetsecurity

July 10, 2026 18:14 CEST Scheduled - We will be performing a database re-synchronisation for 365 Permission Manager over the weekend. During this maintenance period, the application will be unavailable. Users may be able to access the login page, but after signing in they will encounter errors in the console and all product functionality will remain unavailable. Service will be restored once the re-synchronisation has been completed. We apologise for the inconvenience and appreciate your understanding. July 10, 2026 18:34 CEST Active - Scheduled Maintenance has started. July 11, 2026 11:36 CEST Completed - Scheduled Maintenance has ended and 365 Permission Manager is fully available again.

June 2, 2026 12:14 CEST Scheduled - We plan to release Major Version 6.57.0.0 of the Control panel on this day: 2026-06-13 10:15am CEST Due to the nature of this release, there might be functional upgrades and updates alongside with Bugfixes. The Control Panel won't be available during the maintenance window. Other services and email flow will not be affected by this maintenance. June 13, 2026 10:15 CEST Active - Update to major version 6.57.0.0 of the Control Panel will start now. The Control Panel won't be available during the maintenance window. Other services and email flow will not be affected by this maintenance. June 13, 2026 12:03 CEST Completed - Update to major version 6.57.0.0 of the Control Panel has been completed. The Control Panel is now fully operational.

June 2, 2026 16:48 CEST Investigating - We are currently observing reports of emails being deferred when the receiving Host is a Microsoft Tenant. From our current findings this seems to only affect German M365 Tenants. The behavior can be identified by following SMTP Code: 421 4.3.2 The maximum number of concurrent connections per resource forest has exceeded a limit, closing transmission channel Affected emails are in the deferred state. We are trying to deliver inbound deferred emails for up to 7 days and outbound emails we are trying to deliver up to 24 hours. Other services are not affected. June 2, 2026 17:32 CEST Monitoring - Microsoft is working to resolve the observed issue as soon as possible. More Details can be found here: https://admin.cloud.microsoft/#/servicehealth/:/alerts/EX1331830 We are monitoring the situation closely. Other services are not affected. June 3, 2026 00:57 CEST Resolved - We now observe stable email delivery to all M365 environments. Previously deferred emails have also been successfully delivered. M365 Admins can access more information here: https://admin.cloud.microsoft/#/servicehealth/:/alerts/EX1331830.

May 27, 2026 15:33 CEST Scheduled - We plan to release a major version 6.56.0.0 of the Control Panel on 2026-05-28 at 03:30pm UTC+2 This release contains functional upgrades and bug fixes. No downtime is expected, and the Control Panel service will remain available throughout the maintenance time window. Other services and email flow will not be affected by this maintenance. May 28, 2026 15:30 CEST Active - Update to major version 6.56.0.0 of the Control Panel will start now. May 28, 2026 15:44 CEST Completed - Scheduled Maintenance has been completed.

May 6, 2026 14:59 CEST Scheduled - We plan to release a major version 6.55.0.0 of the Control Panel on 2026-05-07 at 03:20pm UTC+2 This release contains functional upgrades and bug fixes. No downtime is expected, and the Control Panel service will remain available throughout the maintenance time window. Other services and email flow will not be affected by this maintenance. May 7, 2026 15:20 CEST Active - Update to major version 6.55.0.0 of the Control Panel will start now. May 7, 2026 15:37 CEST Completed - Scheduled Maintenance has been completed.

April 7, 2026 16:32 CEST Scheduled - We plan to release a major version 6.53.0.0 of the Control Panel on 2026-04-08 at 03:00pm UTC+2 This release contains functional upgrades and bug fixes. No downtime is expected, and the Control Panel service will remain available throughout the maintenance time window. Other services and email flow will not be affected by this maintenance. April 8, 2026 15:03 CEST Active - Update to major version 6.53.0.0 of the Control Panel will start now. April 8, 2026 15:26 CEST Completed - Scheduled Maintenance has been completed.

March 26, 2026 12:05 CET Identified - Microsoft incident reference: EX1259460 Issue Description: Some users may be unable to access custom add-ins through any Exchange Online connection method. Latest updates from Microsoft: 26/03/2026 9:04:00 PM – Microsoft is investigating the possibility that incoming traffic may not be appropriately balanced throughout the affected environment while also continuing to review the previously identified exception to determine the root cause and a strategy that remediates impact. 25/03/2026 8:35:00 AM – Microsoft hasn't confirmed a viable workaround, however they have identified an authentication-related exception which may be contributing to the impact, and they are further reviewing this exception to aid in their root cause analysis. Should you wish to follow updates from Microsoft directly you may do so from the Microsoft Service Health Dashboard under ID EX1259460 https://learn.microsoft.com/en-us/microsoft-365/admin/manage/health-dashboard-overview If you are impacted by this and are unable to wait for a resolution from Microsoft, you may find available workarounds as below: Total Protection Outlook Add-in Workaround http://support.hornetsecurity.com/hc/en-us/articles/21797951259537-Manual-installation-of-the-Outlook-add-in AIRV Outlook Add-in Workaround http://cp.hornetsecurity.com/manual/en/ai_recipient_validation/t_deploy_ai_recipient_validation_add_in_manually.html April 1, 2026 10:39 CEST Resolved - Microsoft incident ID EX1259460 has been set to status "Service Restored". Below is the final status posted by Microsoft: We’ve identified that a recent Exchange Web Services (EWS) deprecation update and an Exchange Online authentication change prevented users from accessing custom add-ins in Outlook. To remediate this issue, we rolled back both offending changes and verified through service monitoring that this action successfully resolved the impact. Admins that have disabled EWS may continue to experience this issue and we recommend that admins re-enable EWS at this time. For additional guidance on managing Exchange Web Services, please refer to the following: https://learn.microsoft.com/en-us/exchange/client-developer/exchange-web-services/how-to-control-access-to-ews-in-exchange Scope of impact: Some users who are attempted to access custom add-ins through all Exchange Online connection methods may have been impacted. Start time: Thursday, March 12, 2026, at 10:04 PM UTC End time: Friday, March 27, 2026, at 1:40 AM UTC Root cause: A recent EWS deprecation update and an Exchange Online authentication change prevented users from accessing custom add-ins in Outlook. Next steps: - We’re reviewing how the impacting changes prevented users from accessing custom add-ins so we can avoid similar issues in the future, as EWS is slated to be deprecated by October 2026. This is the final update for the event.

March 27, 2026 14:09 CET Identified - The 365 Total Backup Service (DE Region) is partially disrupted. The root cause has already been identified and our Technical Teams are currently working on a solution. We will keep this space updated as soon as we have an update on the progress. All other services and regions are not affected. March 30, 2026 10:09 CEST Monitoring - The 365 Total Backup Service is fully operational again. The incident is currently still being monitored. March 31, 2026 09:45 CEST Resolved - The cause of the incident has been resolved. The 365 Total Backup Service (DE Region) is fully operational.

February 17, 2026 12:42 CET Investigating - We are currently investigating reports of missing Microsoft Outlook Add‑ins. We have opened a high priority support case to notify Microsoft of the issue. At this time, Microsoft is actively working to determine the root cause. The issue affects certain tenants where Add‑ins fail to install or previously installed Add‑ins unexpectedly disappear. Other tenants remain unaffected. We will provide further updates as soon as additional information becomes available. February 18, 2026 15:42 CET Investigating - As a workaround you can manually deploy the Outlook Add-ins in your Microsoft 365 Tenant. Total Protection Outlook Add-in Workaround https://support.hornetsecurity.com/hc/en-us/articles/21797951259537-Manual-installation-of-the-Outlook-add-in AIRV Outlook Add-in Workaround https://cp.hornetsecurity.com/manual/en/ai_recipient_validation/t_deploy_ai_recipient_validation_add_in_manually.html We will provide further updates as soon as additional information becomes available. February 24, 2026 18:56 CET Investigating - We continue to work closely with Microsoft as we investigate the Deploy Issues with our Outlook Add‑ins. Our high‑priority support case remains active, and we are staying in constant communication to support their efforts. At this stage, we unfortunately cannot provide a solution yet, but we highly recommend utilizing the workaround shared below. We will share updates as soon as new information is available through our joint investigation. February 26, 2026 14:10 CET Monitoring - Microsoft have deployed a fix for the issue causing Add-ins to disappear. Affected customers will need to reinstall the Total Protection Add-in through the Control Panel. If the Add-in appears as already installed, please uninstall it first and then reinstall it via the Control Panel. We will continue to monitor the situation. March 3, 2026 09:42 CET Investigating - The previously communicated fix deployed by Microsoft did not resolve the issue as expected. We have re‑escalated the matter to Microsoft, and remain in close contact with their engineering teams as they reassess the situation. We understand the impact this may be causing and will share further updates as soon as additional information becomes available. March 10, 2026 10:12 CET Investigating - We are continuing to work with Microsoft through multiple escalation channels regarding the issue affecting Outlook Add-ins. Microsoft’s engineering teams are actively investigating the root cause and working on a resolution. We understand the impact this may have and will provide further updates as soon as additional information becomes available, thank you for your patience thus far. While we work on resolving the issue, we encourage you to use the recommended workarounds shared below. Be sure to execute each step to successfully deploy the Add‑in manually. March 12, 2026 15:19 CET Investigating - Microsoft is actively preparing a global fix for the Outlook Add‑in issue. We continue to work closely with their engineering teams through multiple escalation channels. We can confirm that we have successfully tested an early version of Microsoft’s fix. Microsoft is now conducting further quality assurance before beginning a phased worldwide rollout. We will share additional updates as soon as Microsoft provides a confirmed release timeline. Thank you for your patience. In the meantime, the recommended workarounds remain available below. Total Protection Outlook Add-in Workaround support.hornetsecurity.com/hc/en-us/articles/21797951259537-Manual-installation-of-the-Outlook-add-in AIRV Outlook Add-in Workaround cp.hornetsecurity.com/manual/en/ai_recipient_validation/t_deploy_ai_recipient_validation_add_in_manually.html March 13, 2026 09:22 CET Monitoring - Microsoft has confirmed that a global fix has been deployed to resolve the issue affecting all existing tenants. Further details can be found in the official documentation: https://learn.microsoft.com/en-us/office/dev/add-ins/resources/resources-office-add-in-known-issues#issue-intermittent-failure-to-load-or-deploy-office-add-ins-due-to-exchange-authentication-changes If you previously implemented our temporary workaround, please remove the Add‑in that was deployed via the Integrated Apps section. Once this has been removed, installation through the Control Panel will function normally again. We will monitor the situation closely. March 16, 2026 15:28 CET Monitoring - No further issues have been observed, and we will continue to monitor the situation through the end of the week. If you encounter any difficulties during the installation of the Outlook add‑in, please make sure to remove any previously applied workaround before installing our Outlook Add-ins via the Control Panel. If you encounter any Issues during the installation please contact our support. March 20, 2026 17:39 CET Monitoring - A high number of successful installations have been observed this week, confirming expected behavior across affected environments. We expect this positive trend to continue into the coming week. If you encounter any technical issues during installation, please contact our Support team. Prior to installing the Add-in via the Control Panel, ensure that any previously implemented workaround has been removed. March 24, 2026 11:41 CET Investigating - A small subset of customers still report the add-in as missing despite successful, error-free installations. As logs confirm successful deployments, affected customers should contact support and provide their Microsoft Tenant ID to help us identify impacted tenants while we continue working with Microsoft on a resolution. We have also released an updated manifest to fix prior manual installation issues. Customers who experienced problems are advised to retry using the latest version. See our documentation for guidance and the updated manifest: https://support.hornetsecurity.com/hc/en-us/articles/21797951259537-Manual-installation-of-the-Outlook-add-in March 26, 2026 12:05 CET Resolved - After thorough investigation all Hornetsecurity Outlook add-in deployment mechanisms proved to be working successfully as designed, and the root cause of this incident has been confirmed as an external Microsoft Incident with reference ID EX1259460 having global impact. Should you wish to follow further updates directly from Microsoft you may do so from the Microsoft Service Health Dashboard: https://learn.microsoft.com/en-us/microsoft-365/admin/manage/health-dashboard-overview If you are impacted by this and are unable to wait for a resolution from Microsoft, you may find available workarounds as below: Total Protection Outlook Add-in Workaround http://support.hornetsecurity.com/hc/en-us/articles/21797951259537-Manual-installation-of-the-Outlook-add-in AIRV Outlook Add-in Workaround http://cp.hornetsecurity.com/manual/en/ai_recipient_validation/t_deploy_ai_recipient_validation_add_in_manually.html

March 16, 2026 10:16 CET Scheduled - We plan to release a new version on this day: 2026-03-17 10:00 CET The 365 Permission Manager Service may be partially disrupted during the maintenance time window. Auto-remediation for violations will not be working during this time window, however the backlog for violations will be actioned automatically after the maintenance window is finished. Other services and the email flow will not be affected by this maintenance. March 17, 2026 10:00 CET Active - Scheduled Maintenance has started. March 18, 2026 10:00 CET Completed - Scheduled Maintenance has successfully completed.

March 12, 2026 15:01 CET Investigating - The 365 Permission Manager Service is currently unavailable. Our Technical Team is actively investigating the root cause and working to resolve the issue as quickly as possible. Other services and email flow are not affected. March 13, 2026 11:10 CET Monitoring - The cause of the incident was identified and addressed. The 365 Permission Manager Service is fully operational again. The incident is currently still being monitored. March 16, 2026 10:08 CET Resolved - After careful and thorough monitoring, all features have been confirmed to be fully functional.