Verified this bug on rhevh 6.2-0.14 build. It is fixed.
proxy port is added. Register rhn with proxy setting is successful.
*** Bug 738184 has been marked as a duplicate of this bug. ***
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.