Seemingly randomly, using the LXD Juju cloud provider with Juju 3.1 to 3.3, running 
```
 juju deploy vault vault --model lxd-cloud/cell0-ovn-central --config auto-generate-root-ca-cert=true --config totally-unsecure-auto-unlock=true --channel 1.8/stable --num-units 1

juju deploy ovn-central ovn-central --model lxd-cloud/cell0-ovn-central --channel 23.03/stable --num-units 3

juju integrate vault:db postgresql:db --model lxd-cloud/cell0-ovn-central

The ovn-central charm will get stuck in a blocked state, reporting ` Ports which should be open, but are not: 6641, 6642`

Juju debug-log shows the following:

```
 unit-ovn-central-46: 04:32:23 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined ERROR could not download resource: HTTP request failed: Get https://[fd42:7768:dbe4:bff0:216:3eff:fe18:db73]:17070/model/fa159398-1d3d-4c62-8939-58ee4b5b1c07/units/unit-ovn-central-46/resources/prometheus-ovn-exporter: resource#ovn-central/prometheus-ovn-exporter not found
unit-ovn-central-47: 04:32:26 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Failed to start ovn-central.service: Unit ovn-central.service is masked.
unit-ovn-central-47: 04:32:26 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Failed to start ovn-ovsdb-server-nb.service: Unit ovn-ovsdb-server-nb.service is masked.
unit-ovn-central-47: 04:32:26 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Failed to start ovn-ovsdb-server-sb.service: Unit ovn-ovsdb-server-sb.service is masked.
unit-ovn-central-47: 04:32:26 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Removed /etc/systemd/system/ovn-central.service.
unit-ovn-central-47: 04:32:27 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Created symlink /etc/systemd/system/multi-user.target.wants/ovn-central.service → /lib/systemd/system/ovn-central.service.
unit-ovn-central-47: 04:32:27 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Removed /etc/systemd/system/ovn-ovsdb-server-nb.service.
unit-ovn-central-47: 04:32:28 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Created symlink /etc/systemd/system/ovn-nb-ovsdb.service → /lib/systemd/system/ovn-ovsdb-server-nb.service.
unit-ovn-central-47: 04:32:28 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Removed /etc/systemd/system/ovn-ovsdb-server-sb.service.
unit-ovn-central-46: 04:32:28 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Failed to start ovn-central.service: Unit ovn-central.service is masked.
unit-ovn-central-46: 04:32:28 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Failed to start ovn-ovsdb-server-nb.service: Unit ovn-ovsdb-server-nb.service is masked.
unit-ovn-central-46: 04:32:28 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Failed to start ovn-ovsdb-server-sb.service: Unit ovn-ovsdb-server-sb.service is masked.
unit-ovn-central-47: 04:32:28 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed Created symlink /etc/systemd/system/ovn-sb-ovsdb.service → /lib/systemd/system/ovn-ovsdb-server-sb.service.
unit-ovn-central-46: 04:32:29 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Removed /etc/systemd/system/ovn-central.service.
unit-ovn-central-47: 04:32:29 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed 2023-11-23T04:32:29Z|00001|unixctl|WARN|failed to connect to /var/run/ovn/ovnsb_db.ctl
unit-ovn-central-47: 04:32:29 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed ovn-appctl: cannot connect to "/var/run/ovn/ovnsb_db.ctl" (No such file or directory)
unit-ovn-central-47: 04:32:29 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed 2023-11-23T04:32:29Z|00001|unixctl|WARN|failed to connect to /var/run/ovn/ovnsb_db.ctl
unit-ovn-central-47: 04:32:29 WARNING unit.ovn-central/47.ovsdb-peer-relation-changed ovn-appctl: cannot connect to "/var/run/ovn/ovnsb_db.ctl" (No such file or directory)
unit-ovn-central-46: 04:32:29 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Created symlink /etc/systemd/system/multi-user.target.wants/ovn-central.service → /lib/systemd/system/ovn-central.service.
unit-ovn-central-46: 04:32:30 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Removed /etc/systemd/system/ovn-ovsdb-server-nb.service.
unit-ovn-central-46: 04:32:30 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Created symlink /etc/systemd/system/ovn-nb-ovsdb.service → /lib/systemd/system/ovn-ovsdb-server-nb.service.
unit-ovn-central-46: 04:32:30 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Removed /etc/systemd/system/ovn-ovsdb-server-sb.service.
unit-ovn-central-46: 04:32:31 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined Created symlink /etc/systemd/system/ovn-sb-ovsdb.service → /lib/systemd/system/ovn-ovsdb-server-sb.service.
unit-ovn-central-46: 04:32:31 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined 2023-11-23T04:32:31Z|00001|unixctl|WARN|failed to connect to /var/run/ovn/ovnsb_db.ctl
unit-ovn-central-46: 04:32:31 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined ovn-appctl: cannot connect to "/var/run/ovn/ovnsb_db.ctl" (No such file or directory)
unit-ovn-central-46: 04:32:31 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined 2023-11-23T04:32:31Z|00001|unixctl|WARN|failed to connect to /var/run/ovn/ovnsb_db.ctl
unit-ovn-central-46: 04:32:31 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined ovn-appctl: cannot connect to "/var/run/ovn/ovnsb_db.ctl" (No such file or directory)
unit-ovn-central-46: 04:32:31 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined 2023-11-23T04:32:31Z|00001|unixctl|WARN|failed to connect to /var/run/ovn/ovnsb_db.ctl
unit-ovn-central-46: 04:32:31 WARNING unit.ovn-central/46.ovsdb-peer-relation-joined ovn-appctl: cannot connect to "/var/run/ovn/ovnsb_db.ctl" (No such file or directory)
unit-ovn-central-45: 04:32:31 WARNING unit.ovn-central/45.certificates-relation-changed ERROR could not download resource: HTTP request failed: Get https://10.184.200.233:17070/model/fa159398-1d3d-4c62-8939-58ee4b5b1c07/units/unit-ovn-central-45/resources/prometheus-ovn-exporter: resource#ovn-central/prometheus-ovn-exporter not found
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: No network binding for internal
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: No network binding for admin
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: No network binding for public
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: No network binding for internal
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: No network binding for admin
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: No network binding for public
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: Skipping request for certificate for ip in internal space, no local address found
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: Skipping request for certificate for ip in admin space, no local address found
unit-ovn-central-45: 04:32:32 WARNING unit.ovn-central/45.juju-log certificates:85: Skipping request for certificate for ip in public space, no local address found
unit-ovn-central-46: 04:32:34 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: No network binding for internal
unit-ovn-central-46: 04:32:35 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: No network binding for admin
unit-ovn-central-46: 04:32:35 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: No network binding for public
unit-ovn-central-46: 04:32:35 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: No network binding for internal
unit-ovn-central-46: 04:32:35 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: No network binding for admin
unit-ovn-central-46: 04:32:35 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: No network binding for public
unit-ovn-central-46: 04:32:35 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: Skipping request for certificate for ip in internal space, no local address found
unit-ovn-central-46: 04:32:35 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: Skipping request for certificate for ip in admin space, no local address found
unit-ovn-central-46: 04:32:35 WARNING unit.ovn-central/46.juju-log ovsdb-peer:83: Skipping request for certificate for ip in public space, no local address found
unit-ovn-central-47: 04:32:37 WARNING unit.ovn-central/47.certificates-relation-changed ERROR could not download resource: HTTP request failed: Get https://[fd42:7768:dbe4:bff0:216:3eff:fe18:db73]:17070/model/fa159398-1d3d-4c62-8939-58ee4b5b1c07/units/unit-ovn-central-47/resources/prometheus-ovn-exporter: resource#ovn-central/prometheus-ovn-exporter not found
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: No network binding for internal
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: No network binding for admin
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: No network binding for public
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: No network binding for internal
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: No network binding for admin
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: No network binding for public
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: Skipping request for certificate for ip in internal space, no local address found
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: Skipping request for certificate for ip in admin space, no local address found
unit-ovn-central-47: 04:32:38 WARNING unit.ovn-central/47.juju-log certificates:85: Skipping request for certificate for ip in public space, no local address found
unit-ovn-central-46: 04:32:39 WARNING unit.ovn-central/46.ovsdb-peer-relation-changed ERROR could not download resource: HTTP request failed: Get https://[fd42:7768:dbe4:bff0:216:3eff:fe18:db73]:17070/model/fa159398-1d3d-4c62-8939-58ee4b5b1c07/units/unit-ovn-central-46/resources/prometheus-ovn-exporter: resource#ovn-central/prometheus-ovn-exporter not found
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: No network binding for internal
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: No network binding for admin
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: No network binding for public
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: No network binding for internal
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: No network binding for admin
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: No network binding for public
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: Skipping request for certificate for ip in internal space, no local address found
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: Skipping request for certificate for ip in admin space, no local address found
unit-ovn-central-46: 04:32:42 WARNING unit.ovn-central/46.juju-log coordinator:84: Skipping request for certificate for ip in public space, no local address found
unit-ovn-central-46: 04:32:44 WARNING unit.ovn-central/46.coordinator-relation-changed ERROR could not download resource: HTTP request failed: Get https://[fd42:7768:dbe4:bff0:216:3eff:fe18:db73]:17070/model/fa159398-1d3d-4c62-8939-58ee4b5b1c07/units/unit-ovn-central-46/resources/prometheus-ovn-exporter: resource#ovn-central/prometheus-ovn-exporter not found

```