Outage in Mendix
Mendix Studio Pro Partial Outage due to Windows 11 October 14 Update
Resolved MajorIncident Report
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.
Components affected
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Latest Updates ( sorted recent to last )
RESOLVED
4 months ago - at 10/22/2025 06:12AM
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.
MONITORING
5 months ago - at 10/17/2025 12:06PM
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.
INVESTIGATING
5 months ago - at 10/15/2025 04:37PM
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.
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