This bugzilla has Keywords: Regression.  

Since no regressions are allowed between releases, 
it is also being proposed as a blocker for this release.  

Please resolve ASAP.

Release note added. If any revisions are required, please set the 
"requires_release_notes" flag to "?" and edit the "Release Notes" field accordingly.
All revisions will be proofread by the Engineering Content Services team.

New Contents:
* net is a tool for the administration of Samba and remote CIFS servers. A previous addition to net contained a built-in assumption that when a user ran a net subcommand (for example, net join) a the command line, the user would always provide not only their username, but the corresponding password too. Therefore, the subcommand would fail when this password was not provided. In this updated version of Samba, the user is prompted for a password if one is required.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2009-0251.html