Hello,
For the redis part, i just set the values in the /etc/onlyoffice/documentserver/default.json redis section.
If it’s possible, please rollback default.json file to default state, because Document server Community Edition doesn’t use this service.
As for the situation in general. It seems that something interrupts Document server attempt to get a file from the storage example. Is it possible to disable your nginx proxy\freebsd firewall just for a test? With this step, we will grant free access to the Internet for Document server.
Additionally, I would prefer to take a look at whole Document server logs folder (not edited logs). If it’s possible, you can contact me via PM to provide the logs (fresh logs, when the situation is reproduced).