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Trying to connect to a RHEL5 VM causes a warning in the console '(remote-viewer:9644): GSpice-WARNING **: major mismatch (got 1, expected 2)' and an error message that it couldn't connect to the remote VM.
Tested with spice-gtk.x86_64 0:0.20-9.el6

This is fixed by http://lists.freedesktop.org/archives/spice-devel/2013-October/014897.html, scratch build with these 2 patches available from http://brewweb.devel.redhat.com/brew/taskinfo?taskID=6398063

*** Bug 813889 has been marked as a duplicate of this bug. ***

We have access to one VM running on RHEV2.2/RHEL5.y host --> qa_ack+

FWIW, connection works fine with F20 client (spice-gtk-0.23-1.fc20.x86_64) so the fix should work fine in RHEL6/7 as well once it makes its way to the builds...

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1487.html