This requires all three symptoms to be in place:
* Unable to connect via any UI as any user.
* System shows as active.
* The server the database is on gives a low space (or no space) warning.
---- After adding space, the system still shows the above issues.
Once the DB has ran out of space to perform its transactions, the message queues can become unstable.
A restart of the system is required. If this does not resolve the issue fully, a cold start with a truncation of the DB Tables (these statements can be provided by Automic Support) will be necessary.