Fix Greenbone OpenVAS installation

We have an OpenVAS installation which stopped working a few weeks ago. I'm seeing errors to do with Redis, but I have a feeling that might be a red herring.

The web app is up, but the scanner service will not start, and if I kick off any tasks in the web dashboard, it immediately changes status to "Stopped at 0%".

Here's the error;
/etc/init.d/openvas-scanner status
● openvas-scanner.service - Open Vulnerability Assessment System Scanner Daemon
Loaded: loaded (/lib/systemd/system/openvas-scanner.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2023-03-31 14:06:22 UTC; 1 day 23h ago
Docs: man:openvassd(8)
http://www.openvas.org/
Main PID: 13454 (code=exited, status=1/FAILURE)

Mar 31 14:06:22 ip-172-31-25-153 openvassd[13453]: get_redis_ctx: redis connection error: No such file or directory
Mar 31 14:06:22 ip-172-31-25-153 openvassd[13453]: redis_new: cannot access redis at '/var/run/redis-openvas/red…r.sock'
Mar 31 14:06:22 ip-172-31-25-153 openvassd[13453]: get_redis_ctx: redis connection error: No such file or directory
Mar 31 14:06:22 ip-172-31-25-153 openvassd[13454]: redis_find: redis connection error: No such file or directory
Mar 31 14:06:22 ip-172-31-25-153 openvassd[13454]: get_redis_ctx: redis connection error: No such file or directory
Mar 31 14:06:22 ip-172-31-25-153 openvassd[13454]: redis_new: cannot access redis at '/var/run/redis-openvas/red…r.sock'
Mar 31 14:06:22 ip-172-31-25-153 openvassd[13454]: get_redis_ctx: redis connection error: No such file or directory
Mar 31 14:06:22 ip-172-31-25-153 systemd[1]: Started Open Vulnerability Assessment System Scanner Daemon.
Mar 31 14:06:22 ip-172-31-25-153 systemd[1]: openvas-scanner.service: Main process exited, code=exited, status=1/FAILURE
Mar 31 14:06:22 ip-172-31-25-153 systemd[1]: openvas-scanner.service: Failed with result 'exit-code'.
Hint: Some lines were ellipsized, use -l to show in full.

I can provide SSH access with sudo permissions if you give me your public key, and I have a snapshot of the server, so from my perspective, just go for it. :)

It would also be acceptable if you want to/can export our config, and I'll just provision a new server for you to do a fresh OpenVAS install and import our stuff back in. Whatever is easiest.