2345872 - FTPS communication channel terminates with "Unexpected reply code 536"

File Adapter is used to connect to FTPS server. After importing the certificate chain in SAP Process Integration/Orchestration (PI/PO)system, the following error occurs during message processing:

Delivery of the message to the application using connection File_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: Error when getting an FTP connection from connection pool: com.sap.aii.af.lib.util.concurrent.ResourcePoolException: Unable to create new pooled resource: FTPEx: Unexpected reply codeSecurity mechanism not supported.

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If the detailed tracing for File adapter is activated, the following reply from the FTPS server can be found in the defaultTrace:

ftp server returns reply '536 Security mechanism not supported'

or

ftp server returns reply '534 Policy requires SSL'

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

Read more...

• SAP NetWeaver Process Integration 7.1
• SAP enhancement package 1 for SAP NetWeaver Process Integration 7.1
• SAP NetWeaver 7.3
• SAP enhancement package 1 for SAP NetWeaver 7.3
• SAP NetWeaver 7.4
• SAP NetWeaver 7.5

SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP NetWeaver Process Integration 7.1 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 1 for SAP NetWeaver Process Integration 7.1

FTPS, FTP, Receiver Communication Channel, PROT,, PROT P, PROT C, Data Channel Protection Level, RFC 2228, FTP Security Extensions, FTPEx, Unexpected reply code, Security mechanism not supported, Data connection protection clear not supported, 536, 534, Policy requires SSL, Reply code, Process Integration 7.10, PI 7.10, Process Integration 7.11, PI 7.11, Process Integration 7.30, PI 7.30, Process Integration 7.31, PI 7.31, Process Orchestration 7.4, PI 7.4, PO 7.4, Process Orchestration 7.5, PI 7.5, PO 7.5, XI, AEX , KBA , BC-XI-CON-FIL , File Adapter , Problem