Comment # 9 on bug 1190628 from Damien Radtke

Ahh, I think what I'm seeing is an issue introduced in the latest release of
Vagrant. With this workaround, `vagrant rsync` worked for me:
https://github.com/hashicorp/vagrant/issues/12344#issuecomment-835386483

My guess then is that the other boxes I tried support SHA1, but the latest
releases of openSUSE don't, hence the connection error.

Apologies for the noise!