UltraVNC viewer 1.2.1.1 unable to connect to 1.0.9.5 server

[VncUser2014]

There is a problem since UltraVNC Viewer 1.2.0.9 that the Viewer is unable to connect to certain older versions of UltraVNC Server, especially 1.0.9.5
UltraVNC Viewer 1.2.1.1 has the same problem. The lower right part of the screen is distorted (possibly the last screen buffer position?), and input is impossible. Usually the connection drops immediately and the viewer tries to re-connect.
This problem did not exist yet in UltraVNC Viewer 1.2.0.6.

This is a big issue as we have hundreds of VNC servers on 1.0.9.5 on XP.

[Rudi De Vos]

We are first gonna collect 1.2.11 issue's, so we can take a look at all of them together.
Give us a few weeks ..

[VncUser2014]

Thanks for the feedback. This issue was reported by other users as well from viewer 1.2.0.9. It seems to be that from that version on the auto connect option seems to select u2 instead of the usual hextile

[Rudi De Vos]

Perhaps you can test the viewer by selecting the options manual, if we could limit the cause to a certain option setting,
the bug tracing could be limited to specific code parts.

[VncUser2014]

Setup of test:

viewer 64-bit 1.2.1.1 against server 32-bit 1.0.9.5. When the viewer settings are on auto, the viewer connects, but the screen is distorted / artifacted on the bottom right screen tile and no input is possible. The auto selection selects u2.
viewer 64-bit 1.2.0.6 against server 32-bit 1.0.9.5. When the viewer settings are on auto, the viewer connects, screen is normal & input is possible. The auto selection selects hextile.

The strange thing is that when I select manual connection options in 1.2.1.1 and set it to u2, the viewer still works fine...??

[Rudi De Vos]

Thanks, this narrow the code search

[Rudi De Vos]

found, seems that the initial encoder (hextile) is used before we check that the server support it.

By changing that in u2, we use an encoder that is unknown.
If you later, switch to u2, the viewer is already aware that u2 is not supported for the old server and use zrle instead.
If manual selected there is an extra check, but not for the auto mode.

To make everybody happy
default auto mode: back to hextile
*no lossy compression
*connection to old servers works as expected

[Rudi De Vos]

Update viewers are already in the translation try

http://www.uvnc.eu/download/1211/ultrav ... iewers.zip

[WAJIM]

Update viewers are already in the translation try

Thanks, ENU works fine, hextile works in auto mode for old servers.

[VncUser2014]

Thank you for the fix!