Receiver File Adapter Issue

Hi,

I have a scenario like R3(IDOC)->XI(Mapping)->FTP(Content Conversion)

I am trying to FTP a file across to a vendor's FTP server using the reciver file . adapter. The target filename is of the form %ABC%IJK%%b.However on posting the file i get a message like.

An error occurred while connecting to the FTP server '<hostname>:21'. The FTP server returned the following error message: 'com.sap.aii.adapter.file.ftp.FTPEx: 200 Command Okay. ID: <userid>, Current TR - Recv: <userid>, APRF: *BINARY, Dir: S. Get option: single. '. For details, contact your FTP server vendor.

It seems although the connection is established, the ftp put does not work

Can anyone help on what is the cause of the error and possible solutions.

Regards,

Alex.