A recent RPM update in your repo appears to be unsigned and it is failing install on our systems (which has strict signature checking). Here is the error and package name:
Package xpra-common-1.0.14-1.r24088.el6_10.noarch.rpm is not signed
Sorry about that, it has happened before too: #1906 This affected all centos 6.x builds, 7.0, 7.1 and 7.2. The others were already signed.
I've forced a full re-sign of all RPM packages. Feel free to re-open if I've somehow missed something.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2445