It sounds like you have something that is checking the quality of your 
password.  It lets root give users bad passwords however.  There are PAM 
modules that do this, but I don't know specifically how or what.

OK, Actually I have tested smbpasswd changing on my machine and it seems 
that I get that same error message under two conditions:
1) The "Old Password" I enter does not match the correct old password
2) The "New Password" I enter is weak (I tried "test")

Also notice, that the smbpasswd command works like this
smbpasswd [password]

That is, if you put something after the smbpasswd command it thinks it 
is the new password you want to change to for the current user.

Except when run by root ... check out man.

Austin

sundar narayanasamy wrote:
> Hello,
> 
> When I use smbpassw to change my samba password, I get the following:
> 
> machine 127.0.0.1 rejected the password change: Error was : RAP86: The 
> specified password is invalid.
> 
> But it still lets me set the same password for the user, if I login(or sudo) 
> to root.
> 
> Sundar
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