After Upload File getting "502 Bad Gateway" at Upgrading NAbox

[leaden lodge]

When installing a (new) NAbox (3.4 in this case) the update need to be done via Maintenance>Upload File> NAbox-3.4.update.
At the last part "Cleaning up" I see "502 Bad Gateway" in screen.
After this I can not use NAbox. Because I come back in the screen "You're almost there! "
I keep on in this circle.

What can be wrong?
How can I fix?

[hollow breach]

@unreal spindle have you seen this one?

[unreal spindle]

Looks like 3.4 is cursed. Can you post a screenshot ? Also can you log in with ssh and send the result of « dc ps » ?

[leaden lodge]

^

[leaden lodge]

Attahced 'dc ps'

Hope, this helps you fixing the problem. KR, Maarten.

[unreal spindle]

Where is the “almost there” ?

[leaden lodge]

Thats at the beginning.

At the [Systems] part. This screen keeps there. Also after many times of Uploading the file

OK?