I was successful with this AIO tailscale guide #5439. The entire setup was created inside my Synology NAS Containers.
However, Nextcloud Office (Collabora) just can’t find the Tailscale DNS.
Could not establish connection to the Collabora Online server.
Failed to connect to the remote server: cURL error 6: Could not resolve host: nextcloud.tailxxxx.ts.net (see libcurl - Error Codes) for https://nextcloud.tailxxxx.ts.net/hosting/discovery
It might be possible my Tailscale ACL blocked the connection between the 2 containers: aio-nextcloud and aio-collabora.
"groups": {
"group:admin": ["xxx@github"],
"tagOwners": {
"tag:nextcloud": ["group:admin"],
"acls": [
// Allow all connections
{"action": "accept", "src": ["*"], "dst": ["*:*"]},
// Allow users in "group:users" to access any devices tagged with "nextcloud".
{"action": "accept", "src": ["group:admin"], "dst": ["tag:nextcloud:*"]},
"ssh": [
// Allow all users to SSH into their own devices in check mode.
{
"action": "check",
"src": ["autogroup:member"],
"dst": ["autogroup:self"],
"users": ["autogroup:nonroot", "root"],
Or, the cause could be something else. I’m not sure.