At least two different clients are experiencing this problem with 1.2.0rc2. In
Passive mode both can download but they receive "503 No PORT command issued
first." on upload attempts.
A patch present in the CVS of proftpd is done about this problem.
Can you make a new RPM with this correction please.
I don't think that the package in question is from Red Hat. You may want to file
a bug report with the maintainers of the package you are using. Usually the
maintainers are listed in the changelog.
I am closing this since the package did not come from us.