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https://git.fedorahosted.org/cgit/virt-viewer.git/commit/?id=f9577b9197b737be722cfd5632b6077ce6b041ff

Without this commit, foreign menu will not work when the oVirt VM is behind a firewall.

I can reproduce it.
# rpm -q libgovirt virt-viewer
libgovirt-0.3.3-1.el7.x86_64
virt-viewer-2.0-6.el7.x86_64

Steps:
1. Setup an env and make sure you can connect to ovirt directly but can't connect to vm directly.
2. configure a proxy, make sure you can connect to vm by the proxy.
3. get the ca.crt file from ovirt.
# wget https://ibm-x3250m5-03.qe.lab.eng.nay.redhat.com/ca.crt
4. connect the vm by ovirt.
# remote-viewer --ovirt-ca-file=ca.crt ovirt://ibm-x3250m5-03.qe.lab.eng.nay.redhat.com/$vm

Result:
Can see remote-viewer window pops up and "change cd" menu displays but connect to the vm fail.

Updated virt-viewer to version virt-viewer-2.0-7.el7.x86_64 and verified it again.

can see the foreign menu and can connect to the vm successfully.

So move the bug to VERIFIED.

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.

https://rhn.redhat.com/errata/RHBA-2016-2229.html