[Samba] Which log file?

[Peter Pollock]

I have two photocopiers.

Both have the facility to can to a file on a file server via smb.

Both configured identically.

One can write to a samba share, the other cannot (same server, same share)

I'm searching for a log somewhere that might show me why the write is
failing but I cannot see anything.

Which log file on my fileserver would show me if the server is rejecting
the connection, please?