Push branch using SFTP throught a firewall

[Eric Fesler]

Hi, 

I'm using bzr 1.3.1 on Hardy Heron.

I trying to push a branch using SFTP to a machine behind a firewall.

On the firewall the port 522 is mapped to the port 22 of the target
machine and I can make an ssh connection without any issues.

When I try to push the branch using the following command:
brz push --create-prefix sftp://user@host:522/<target path>
The system asked me the password then I got the following error:
bzr: ERROR: Unable to connect to SSH host <hostname>:522; EOF during
negotiation

I tried the same thing from a windows machine using bzr 1.4 and it works
properly.

Could it be due to Paramiko?

Thanks,

--ERic