maximdelaet

RDM 2026.2.5.1, macOS 26.6.2. Built-in VNC (DevolutionsVnc) sends QEMU Extended Key Event with keysym=0x00000000; only keycode is set. TigerVNC 1.16.2 drops these, so pointer works and no character key registers. Modifiers and "Send Ctrl+Alt+Del" work because they use classic KeyEvent with valid keysyms. Reproduced against Xvnc on Ubuntu and WinVNC on Windows Server 2025. Removing pseudo-encoding -258 from SetEncodings restores full keyboard. Worked prior to the 2026-09-09 build; macOS unchanged since 2026-08-13.

Hi Samuel,

Thanks a lot for the update, I managed to make it work in the default settings this time.

Interesting note however, I didn't manage to restore 1 of my sessions to default for algorithms (kept failing on login), I just ended up re-creating that session with the new defaults applied and that worked as well.

All good now.

Hi all,

I am experiencing the "SSH_FAIL_NO_MATCH (KEX)", although I cannot find the reason for this...

According to the output I get on my C9300-24T Cisco switch during failed attempts, the KEX used by RDM by default should be supported, here are the settings and outputs:

Switch general info:

Switch  Ports    Model                Serial No.   MAC address     Hw Ver.       Sw Ver. 
------  -----   ---------             -----------  --------------  -------       --------
 1       41     C9300-24T             FCW2313GHMA  acf5.e637.bb80  V02           16.12.2s

Switch output on SSH key exchange failure:

Feb  5 09:24:27.423: %SSH-3-NO_MATCH: No matching kex algorithm found: client curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c,ext-info-c server diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1changed

As you can see in above output, there are some KEX supported that should be part of the default suites in RDM...

Current output in RDM (custom with defaults selected):

When enabling every KEX in the list SSH (local) AAA works, for some reason the defaults don't work and I cannot figure out the reason for that. Please advise. Thanks a lot for the help!