Secure FTP transfer problem

Hello all,

We have a project here to transfer some file to a bank using secure FTP
(ssl) from our Iseries. Here is what has been done so far:

We have created a CA certificate.
Installed CA certificate
Created a certificate store
we have imported CA certificate needed to establish connexion with FTP
server. (ENTRUST)
we have activated the certificate
we have allowed secure sockets layer with command "CHGFTPA
ALWSSL(*YES)"

To established the connection, we use the following command:

FTP RMTSYS('csb-oec.bpmca.com') PORT(*SECURE) SECCNN(*IMPLICIT)

We can then connect with our user and password.

But when we issue a PUT command, we get the following error:

Secure connection error, return code -16." Description of code -16:
"-16 The peer system is not recognized

We are stump at this point.

We tested the transfer with a PC and it works fine, so I concluded that
there is something not done right on the Iseries.

Does any one have a suggestion as to where I can find information or
what to do if you have faced this problem before?

Thanks in advance