Thanks. After adding both “overwritehost” and " overwriteprotocol" I get rid of that error problem.
Now everything seems to work when I add the Collabora server but it will not start when I try opening a document.
Are you using a certificate trusted by your computer for your Collabora server ?
If your certificate is self-signed, then you need to accept the certificate on your computer.
To check that you only need to navigate to the Collabora URL and accept the certificate.
But it’s only temporary. In that case, you may want to use some external service like let’s encrypt to generate and sign your Collabora certificate.
please don’t go this path. Always use valid public TLS certificates for Nextcloud and Collabora. Collabora is intended for collaboration - multiple parties involved, this results in effort to make each party trust the self-signed cert… later when you forget to add the self-signed cert to new client you wonder why it works on one client and not on another…
Self-signed certificates are real pain from usability point of view - without good reason browser and OS vendors make it really hard to work with them - you should use them only in case there is no other option and understand why you need them and how to work with it. even different browsers on same client could use different trusted CA stores so issues could be really hard to troubleshoot.
On the Collabora server there are a self signed cert but it is behomind a proxy. The proxy have a valid Let’s encrypt cert and accepts the self signed cert on the Collabora server.
If I go to the proxified address of my Collabora I get “OK” and a trusted cert.
I can probably install a Let’s encrypt cert on the Collabora server also but the client should never get direct contact to that server.
If you publish the system through reverse proxy there is no need to install any cert on Collabora system neither public nor self-signed. You just need to ensure all everything flows through the RP (Nextcloud as well!!)
take a look at this example with traefik:
some settings are not up-to-date but general idea still the same…