HP CIFS Client A.01.09 Administrator's Guide, August 2003

Troubleshooting and Error Messages
HP CIFS Client Error Messages
Chapter 6 77
Almost every Unix machine can be turned into a network sniffer. HP
CIFS Client also refuses to store unencrypted passwords in the user
database.
error: DOS: Access denied
The username/password pair you supplied was not accepted by the
server. You may try to supply the username explicitly with the -U option.