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Password authentication fails with Windows Desktop due to incorrect challenge response #277

@deliciouslytyped

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@deliciouslytyped
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Is your bug report about the Desktop Multivnc or the Mobile MultiVNC?

  • Desktop (wxWidgets) or Mobile (Android):
    Windows Desktop

Which MultiVNC version are you using?

The windows binary from this build (0.11.0): https://github.com/bk138/multivnc/actions/runs/21153814198

Which server are you connecting to?
Custom libvncserver based server.

Describe the bug
Looking at the wireshark packet capture, it appears to be a simple RFB negotiation reaching VNC password authentication. multivnc appears to send back the same response as the challenge it got. Maybe the wxwidgets windows isn't actually using the password I'm typing in?

This is what the log says:

23/01/2026 18:15:30 About to connect to '172.17.173.4', port 64740
23/01/2026 18:15:30 VNC server supports protocol version 3.8 (viewer 3.8)
23/01/2026 18:15:30 We have 1 security types to read
23/01/2026 18:15:30 0) Received security type 2
23/01/2026 18:15:30 Selecting security type 2 (0/1 in the list)
23/01/2026 18:15:30 Selected Security Scheme 2
23/01/2026 18:15:32 VNC connection failed: password check failed!

To Reproduce
I don't have a distributable version of my server right now and I haven't tested with anything else.

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