Unable to push via ftp

[David Muir]

Not sure if this is bug or a limitation of Bazaar's ftp capabilities, 
but I just tried pushing a branch via ftp, and it crapped out saying:

dmuir at dmuir-laptop:~/path/to/local/branch$ bzr push 
ftp://example.com/repos/branch
FTP temporary error: 451 
/repos/branch/.bzr/repository/upload/b7heyf38dq944kqzfswj.pack: 
Append/Restart not permitted, try again. 
Retrying.                                                                                              

FTP temporary error: 451 
/repos/branch/.bzr/repository/upload/b7heyf38dq944kqzfswj.pack: 
Append/Restart not permitted, try again. Retrying.
FTP temporary error: 451 
/repos/branch/.bzr/repository/upload/b7heyf38dq944kqzfswj.pack: 
Append/Restart not permitted, try again. Retrying.
bzr: ERROR: Transport error: FTP temporary error during APPEND 
/repos/branch/.bzr/repository/upload/b7heyf38dq944kqzfswj.pack.Aborting. 
451 /repos/branch/.bzr/repository/upload/b7heyf38dq944kqzfswj.pack: 
Append/Restart not permitted, try again


Same thing happens when I try again.

Any help would be much appreciated.

Cheers,
David