Unable to load OnlyOffice editor

[q16marvin]

Hi,

i wanted to test onlyoffice and i think i did everything correctly like in docs (https://sync-in.com/docs/setup-guide/docker/optional-services/onlyoffice)

in only need to change nginx port from 80 to 8060 (80 is used by a other container).

all containers are starting, i cant find any issues in docker logs but:

is this in onlyoffice.conf correctly?

proxy_pass http://onlyoffice:80/;

docker logs:

sync-in     | 2026-05-28T21:38:35.224872173Z [2026-05-28 21:38:35] INFO (24): [HTTP] <sync-in> HEAD /api/app/spaces/operation/files/personal/test/Neues%20Dokument.xlsx (HTTP/1.1 304) 192.168.204.4 (null bytes in 7ms) Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0 | req-28
sync-in     | 2026-05-28T21:38:35.313384572Z [2026-05-28 21:38:35] INFO (24): [HTTP] <sync-in> GET /api/app/spaces/onlyoffice/settings/files/personal/test/Neues%20Dokument.xlsx (HTTP/1.1 200) 192.168.204.4 (714738 bytes in 24ms) Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0 | req-29

Thank you very much!

[Stephan-P]

I had this exact issue when trying out Euro-Office.
In my case the solution was to change the host forward from http://container_name:port to http://server_ip:port

(In my experience some containers can't be referenced by name, even when they're on the same bridge network.)