Receiver FTPS (Explicit) channel giving error while writing files.

Question

Hi All,
We are facing an issue while using FTPS for writing a file to a partner location. Since this is the first time we are using FTPS, we went through some blogs and notes to configure the same, but still facing problems. Listed below are the steps undertaken for the configuration:
1. Got necessary ports opened on the firewall (the partner FTPS site uses explicit FTPS with control commands on port 21 and data on some custom ports).
2. Tested file transfer on FTPS using some FTPS client tools from the PI 7.11 server being used.
3. Uploaded the server SSL certificates in the NWA Keystore, Trusted CA view in both Base64 and normal formats (all certificates in the chain uploaded).
4. Configured the FTPS receiver channel for the CN name mentioned in the certificate, port 21, directory specified, NO X.509 client authentication (as that is not needed), AUTH TLS, USER,PASS,PBSZ,PROT as command order and using some authentication (user ID, Pwd for logging in). 
But we are still getting the error:
'An error occurred while connecting to the FTP server 'xxxxxx.xxx.com:21'. The FTP server returned the following error message: 'com.sap.aii.adapter.file.ftp.FTPEx: 550 Access denied.'. For details, contact your FTP server vendor..'
On the partner side we could not find any logs and from PI too we are not getting any more details than mentioned above. CAn some let us know any known resolutions to the issue or how to get more details from the trace in PI (we have already increased the trace level of the file adapter to error but nothing more useful is available in Java default trace than mentioned above).
Appreciate any help extended towards this.
Thanks in advance,
Avishek.
Edited by: Avishek Gorai on Feb 21, 2011 8:50 AM

Answer 1

Thank you all for your answers. I want to bring to your notice that the file transfer (using FTPS) is still working using commercially available FTP client tools from the PI server. So in my opinion issues like OS user not having authorization, incorrect user credentials and firewall issues are ruled out. We are facing issue only when using PI adapter for file transfer, this could be due to incorrect commands or command sequence being sent to the Server etc. which the server is rejecting and giving an unauthorized error.
We also tested this by giving incorrect pwd OR changing the command sequence, in which case the errors thrown were more specific and appropriate (like incorrect credentials OR AUTH TLS command missing).
The strange thing is that things work from the PI server when using FTP tools, but fails from PI adapters, which makes me feel there is some issue with the protocol or the setup.
Also please let me mention that we have ensured Java cryptographic toolkit is installed on the PI system being used.