I’am facing the same issue like Can't connect to nextcloud but the former topic was closed without any resolution. Are there any news regarding connection issues with nextcloud webdav?
Btw. I saw in another thread
→ Don’t use /remote.php/dav/files — that endpoint won’t work for n8n
From what’s documented and what users have confirmed working with the n8n Nextcloud node, you should use the /remote.php/webdav/ endpoint and not /remote.php/dav/files/…
Even though /remote.php/dav/files/… can work in genric WebDAV clients, the n8n Nextcloud node is built/tested around /remote.php/webdav/. So when people try the “dav/files” style path, they often hit “Bad request / check parameters” type errors simply because the node isn’t expecting that base URL.
If you’re running n8n in Docker and Nextcloud is self-hosted (or behind something that changes the host), another common cause is Nextcloud trusted domains. The fix is adding whatever host n8n uses (like host.docker.internal, container name, etc.) into Nextcloud’s trusted_domains.