Octavia: Unknown Error (HTTP 500) (Request-ID: None) / Error: Unable to retrieve load balancers

The error can reproduced with an fresh installed openstack-bundle with octavia on Ubuntu 20.04 LTS Focal.

juju status -> all services are fine.

In Openstack Dashboard under Project / Loadbalancers:

Error: Unable to retrieve load balancer

CLI:
openstack loadbalancer list

Unable to establish connection to https://10.6.66.11:9876/v2.0/lbaas/loadbalancers: (‘Connection aborted.’, RemoteDisconnected(‘Remote end closed connection without response’,))


openstack loadbalancer list

Unknown Error (HTTP 500) (Request-ID: None)

Octavia-Config:

octavia-ovn-chassis:
charm: cs:ovn-chassis
octavia-mysql-router:
charm: cs:mysql-router-10
bindings:
“”: *internal-space
octavia:
charm: cs:octavia-34
num_units: 3
bindings:
“”: *internal-space
options:
openstack-origin: *openstack-origin
vip: 10.6.66.11
vip_cidr: 18
region: de1
to:
- lxd:0
- lxd:1
- lxd:2
octavia-hacluster:
charm: cs:hacluster-76
options:
cluster_count: 3
corosync_transport: unicast
octavia-dashboard:
charm: cs:octavia-dashboard

I solved the problem with pause/resume action to octiva charm. With a stable charm, this should actually work without manual intervention.