Mendix incident
Mendix Studio Pro Partial Outage due to Windows 11 October 14 Update
Mendix experienced a major incident on October 15, 2025 affecting Studio Pro, lasting 6d 13h. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Oct 15, 2025, 04:37 PM UTC
With the October 14 update of Windows 11, Studio Pro 9, 10, and 11 can show errors in different panels and editors making it unusable. When you see the message "Hmmm... can't reach this page" with an error code of `ERR_CONNECTION_RESET`, in a tool panel or editor, your workstation is likely affected. Example panels where it can occur are the design properties and toolbox. Example editors are the Microflow, Nanoflow and Rule editor. The current known workarounds for this problem are: - Install "Security Intelligence Update for Microsoft Defender Antivirus - KB2267602 (Version 1.439.210.0)" or - Uninstall the following Windows updates: KB5066835, KB5066131, and KB5065789 We are actively investigating this issue and will update regularly.
- monitoring Oct 17, 2025, 12:06 PM UTC
The current solution to this issue is to install "Security Intelligence Update for Microsoft Defender Antivirus - KB2267602 (Version 1.439.210.0)". This has solved current running incidents, but we are narrowly monitoring this with our customers to make sure all issues are resolved.
- resolved Oct 22, 2025, 06:12 AM UTC
After closely monitoring the issue with existing customers and new incidents, we can confirm that the latest patches from Microsoft resolved the issue that was introduced.