After applying a number of updates to both the host and the virtual machines, I had one virtual machine which would not talk to the network after the updates. Rebooting numerous times didn't help, I couldn't see anything wrong with either it's configuration or the bridge on the host machine.
I ended up restoring that machine from an image and then re-applying the updates and then everything was okay.
Amoung other things the updates included an update to glibc.
I was wondering if anyone else encountered something similar and had come to a better understanding of what went wrong?
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