Issue Summary

After installing recent Windows updates KB5065789 or KB5066835, some customers may experience connectivity issues with the Versa SASE Client.
When attempting to connect to the SASE gateway, the following error may appear:

“Unable to communicate with Versa Service. Please retry again.”

This issue occurs because these Windows updates affect Windows Communication Foundation (WCF), which the Versa SASE Client relies on to send messages.


Affected Versions

  • Operating System: Windows 11 with updates KB5065789 or KB5066835

  • Versa SASE Client: All versions running on the above operating system

Solution: 

Microsoft has released an update on October 16, 2025, as part of the Windows Defender updates, which resolves this issue.
Install update KB2267602 to fix the problem introduced by KB5065789 and KB5066835. 

There is no need to uninstall KB5065789 or KB5066835 once KB2267602 is installed.


Please refer to the below link for the Defender update:
https://www.microsoft.com/en-us/wdsi/defenderupdates


Additional Information

For more details about this Windows issue, refer to Microsoft’s site:
https://learn.microsoft.com/en-us/answers/questions/5585440/kb5066835-update-causing-iis-service-to-not-work