Tried to bypass NginxProxyManager, and tried to connect to collabora directly, with self signed cert, and disabled cert verification from NC side.
On 6.4.10.3 it does NOT work even like this.
but on 6.4.9.3 it DOES work.
Something is going very wrong with these images. Collabora did some RE-UPLOADS of 6.4.10.3 (and i think on 6.4.10.2 also) and REMOVED 6.4.10.4.
TBH, removing and overwriting images on a repository is a very very very bad tactic and can mess up with a lot of automated systems.
If something goes wrong just issue a patch and create a new image. Imagine someone have updated to the broken 6.4.10.3 image and they re-upload a working 6.4.10.3 image, the poor guy will never see the update because the update check will tell him that he is up to date. And he will be struggling for no reason.
I hope OnlyOffice starts supporting Cell Locking/protection soon (it's been on their todo list since 2017..) so I can move there.
rant over..