Key exchange failed with KeepassXC 2.7.9

[skibbipl]

Overview

I'm not sure when the issue started (because I use also bitwarden as a password manager) but recently I tried to connect KeePassXC-Browser extension to my local KeepasXC database and I'm constantly getting "Key exchange failed". It worked few weeks ago so I assume something has changed in firefox.

Steps to Reproduce

1. Open KeePassXC-Browser UI
2. Press reload

Expected Behavior

Connection to the opened KeepassXC database.

Actual Behavior

Key exchange error message.

Context

I followed Troubleshooting guide but everything seems to be working fine. I tried also with a fresh firefox profile and I'm getting the same error.

KeePassXC - 2.7.9 Revision: 8f6dd13 Firefox: 133.0a1 (2024-10-03) (64 bit) KeePassXC-Browser: 1.9.3

Operating System: Windows

[droidmonkey]

Try disabling and re-enabling the connection to Firefox from within keepassxc. You'll have to provide much more information from your troubleshooting attempts for us to help any further.

[skibbipl]

I tried to re-enable Firefox integration from keepassxc. I also enabled debugging of extension but log is vague and doesn't give any details :(

[Error keepass.js:256] KeePassXC-Browser - 7: Message encryption failed. Is KeePassXC running? [global.js:142:13](moz-extension://9708d440-89ad-486b-b9ae-2b39922fb6b0/common/global.js)
[Error keepass.js:333] KeePassXC-Browser - No content script available for this tab. [global.js:142:13](moz-extension://9708d440-89ad-486b-b9ae-2b39922fb6b0/common/global.js)
KeePassXC-Browser: Connecting to native messaging host org.keepassxc.keepassxc_browser [client.js:383:13](moz-extension://9708d440-89ad-486b-b9ae-2b39922fb6b0/background/client.js)
[Error keepass.js:812] KeePassXC-Browser - 9: Key exchange failed. [global.js:142:13](moz-extension://9708d440-89ad-486b-b9ae-2b39922fb6b0/common/global.js)
[Error keepass.js:421] KeePassXC-Browser - No content script available for this tab. [global.js:142:13](moz-extension://9708d440-89ad-486b-b9ae-2b39922fb6b0/common/global.js)

I've translated the error messages from polish locale so they might not be 100% accurate. I would love to help debug this issue, but I don't know where to start...

[droidmonkey]

https://github.com/keepassxreboot/keepassxc-browser/wiki/Troubleshooting-guide#windows

Check your registry and appdata/local/keepassxc folder. Could very well be a Firefox bug as well, are you running a beta or nightly version?

[skibbipl]

As I said, I already tried troubleshooting steps and everything seems to be fine there. Yes, I use nightly firefox, and it is not working for a week or two, so I don't think this is a Firefox bug. Maybe something something changed that affects keepassxc connectivity? Update: I installed firefox stable and I'm still facing this issue. Update 2: I downgraded KeepassXC to 2.7.8 and I'm able to connect with firefox (nightly)

[droidmonkey]

Reinstall 2.7.9, I bet your keepassxc-proxy.exe got deleted or corrupted somehow. Could have even been an aggressive anti-virus quarantining things.

[droidmonkey]

I just installed Firefox and it worked immediately with 2.7.9