DSMR Reader Add-on for Home Assistant

Trying to get this addon working on my HAssOS VM, but at step 7 I’m unable to login. This is the error when I get when trying to access http://myhassosip:7777/admin/:
This site can't be reached. ERR_CONNECTION_REFUSED

HA Supervisor System log shows this when installing the timescaledb addon:
21-03-20 14:14:52 ERROR (MainThread) [supervisor.api.security] Invalid token for access /host/info

Subsequently, the Watchdog starts giving warnings about dsmr_reader:
21-03-20 14:17:35 WARNING (MainThread) [supervisor.misc.tasks] Watchdog found a problem with 0826754b_dsmr_reader!

This message repeats every minute.

Update - apparently I had a configuration error in de TimescaleDB addon, I only added - dsmrreader under databases: and not also under timescale_enabled:. After adding this and restarting the TimescaleDB addon, the TimescaleDb Log shows
[15:38:44] NOTICE: TimescaleDb is running!

I also restarted the DSMR Reader addon, but still I’m unable to access http://myhassosip:7777/admin/.

DSMR Reader Log shows:
nc: getaddrinfo: Name does not resolve

Update2:
On the configuration page of TimescaleDB I’m seeing this under ‘Network’:
Container: 5432/tcp
Host: Disabled

Perhaps I should put something after Host? If so, what? localhost? 127.0.0.1? Something else?

Update3:
Apparently the field under Host only accepts a single number as valid entry, so I’m guessing that’s a badly labeled ‘Port’ field.
Looking at the configuration of the DSMR Reader addon, I’m seeing this:
DJANGO_DATABASE_HOST
77b2833f-timescaledb

Perhaps this is where I should put ‘localhost’ instead of ‘77b2833f-timescaledb’?

Update 4:
Tried changing 77b2833f-timescaledb to both localhost and 127.0.0.1. In both cases, DSMR Reader logs shows this after a couple of minutes:
[ FAIL ] Database connectivity couldn't be verified! Please verify your settings. Exiting...

Update 5:
Fixed it by applying the solution of this post:

So apparently the default host in the DSMR Reader Configuration (77b2833f-timescaledb) might not match the actual internal hostname of TimescaleDB.