I ran nextcloud server and onyloffice server on two different centos 7 VM server.
Nextcloud 11.0.2 (stable)
Document Server v.4.3
Centos 7 kernel 3.10.0-514.10.2.el7.x86_64
I setup DNS / aliases / HOST (A) locally in my DNS Server and also on my ISP an DNS Name with an external official IP for both
Server like Cloud.domain.de and Office.domain.de.
If I configure the nextcloud option for OnylOffice Server with https://IP
it works internally wonderful (see attachment Setting for short info - IP_OK.jpg),
now I like to go with DNS
it doesen' t work internal as well from extern. (attachment DNS_NOT.jpg)
Ping - nslookup works fine with IP as well with DNS and also with aliases internally. All neede ports service are open in the firewall setting in centos as well in my firewall's.
From external my nextcloud server is already reachable, too, but no onlyoffice.
Any Suggestion would be fine!