Problem on windows 11

[JanPesta]

When I try connect with firefox plugin I am getting following error:

Version: 1.8.4.2

Can you please let mw know what could be problem ?

[TiNours38]

Same problem here - firefox / Windows 11 24H2

[dotNetDR]

same problem Windows 11 Pro 24H2

KeePass 2.59
KeePassHttp 1.8.4.2

[pacifist86]

Same issue here:
When opening a webpage in Chrome in which the ChromeKeePass plug-in attempts to autofill a password, it throw the error.

RequestHandler failed: System.Net.HttpListenerException (0x80004005): The request is not supported
at System.Net.HttpListener.EndGetContext(IAsyncResult asyncResult)
at KeePassHttp.KeePassHttpExt._RequestHandler(IAsyncResult r)
at KeePassHttp.KeePassHttpExt.RequestHandler(IAsyncResult r)

Version info:

• KeePass 2.59
• ChromeKeePass 2.1.1 plug-in for Chrome
• KeePassHttp 1.8.4.2
• Windows 11 version 24H2

Not 100% certain when the errors started, but possibly after installing the following Windows update:
2025-10 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5066835) (26100.6899)

[pacifist86]

Upgraded to Windows 11 Version 25H2 today and it resolved my errors. After installing the Windows update and rebooting, I re-opened Chrome, opened to the ChromeKeePass extension options and it prompted me to reconnect to my KeePass database. Once connected, all was working again without errors.

Hope this helps!

[dotNetDR]

Upgraded to Windows 11 Version 25H2 today and it resolved my errors. After installing the Windows update and rebooting, I re-opened Chrome, opened to the ChromeKeePass extension options and it prompted me to reconnect to my KeePass database. Once connected, all was working again without errors.

Hope this helps!

The problem was resolved after updating to 25h2.
version num: 25H2
os version: 26200.7019