The problem is that 10.4 is configured to send plain-text passwords (insist on encrypting them). So, you have two solutions: disable the encryption or upgrade your server that it can accept encrypted passwords. I would suggest the later as (1) you should be anyway and (2) if you disabled it on the client then it will be disabled for all SMB traffic.
Correction:
The problem is that 10.4 is configured to send encrypted passwords (and there is not an option to force plain text on a per case or per account basis). So, you have two solutions: disable the encryption or upgrade your server that it can accept encrypted passwords. I would suggest the later as (1) you should be anyway and (2) if you disabled it on the client then it will be disabled for all SMB traffic.
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