I have made it, many times, of course.
I think the problem is that redis works no longer and I do not now how to start it.
I have already pulled the discourse container, it has not helped however.
I think
I destroy the container,
delete the directory,
pull the container from git
and start from scratch again …
Indeed, I thought discourse-setup took care of the redis install 
I guess you could try installing it “by hand” and follow what is done discourse_docker/install-redis at main · discourse/discourse_docker · GitHub
What is below your screenshot though ?
Any error after ./discourse-setup ?
well redis seems ok here
Discourse should work now! (it doesn´t)
Docker seems to be OK:
According “.launcher logs app” the issue must be with the certificate …:
I’m sorry, my mistake for the systemctl check, I do have redis installed on the host but for another purpose, the redis you’re looking for is installed in the container.
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Ok, one option would be to get a new Ubuntu VM (it costs however pretty much for our institute).
I think it is best solution just now, isn´t it?
that could come from your app.yml, what do you have there ?
## Uncomment these two lines if you wish to add Lets Encrypt (https)
# - "templates/web.ssl.template.yml"
# - "templates/web.letsencrypt.ssl.template.yml"
you might also have hit a letsencrypt’s renew limit…
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no, I am “root” here. It is internal VM, no public access /up to now/
Thank you, it was the solution… 
Now I can access the GUI. I am curius, if the recovery of the backup crashes it again.
Are there any preparations, being necessary for an successful recovery from an other server?
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In my limited experience, I’d say no, I’ve always been surprised by how easy it was to restore (or lucky maybe 
) what happened here was weird. I’d do a backup of the app.yml, just to remember what plugins were installed, (maybe also the conf of the host proxy if ever needed and installed).
ok, Thank you. You know I am an absolut beginner @ Linux. Without tutorials I am lost.
Ok, I copy my app.yml and try it the recovery from the GUI again.
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As I said, white page again:
One sees the name of the forum. There is no error, but not HTML is generated …
some errors during the restore process ?
Could you have some plugins “in the backup” that aren’t in the app.yml of your fresh install ?
there has been no error in the restore process. Concerning the Plugins, I will let it check by my collegaues on Monday and add them to the new app.yml, if there is any of them.
I have opened the SQL /Backup/ I have found no information on installed plugins …
might be a long shot though, since you’ve already try the safe mode …
my bet at this point would be the CSP:
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