Hello,
This is more likely to be a Horizon bug than an issue with Kolla itself, since Kolla doesn't change much from the default configuration.
You should check Horizon logs in /var/log/kolla/horizon to find the error. I would also encourage you to upgrade to a more recent release, since Train has been marked as End of Life in Kolla recently.
Cheers,
Pierre Riteau (priteau)
We're running kolla train and we're seeing an apparent bug when we try to add or remove security groups on a port. We see error "Failed to update port <ID>". It works fine in CLI; we only see this in Horizon. Is this a known bug, or are we doing something wrong?