Samba command line tools output the following messages along with their expected output:
WARNING: No path in service IPC$ - making it unavailable!
NOTE: Service IPC$ is flagged unavailable.
Those messages are harmless and can be safely ignored!
The samba configuration defines a share named "[IPC$]" which doesn't have an associated "path" option. This share definition was required in the early "s3fs" configuration of Samba4 and is now obsolete. As the Samba config parser checks are now more strict, they output this message.