3224464 - Connectivity Issue from PI/PO to SFTP server

Unable to connect to SFTP server. Following errors can be seen:

Catching java.lang.Exception: /xxx/xxx/ does not exist
at com.sap.aii.adapter.sftp.ra.rar.jca.CCIInteraction.sendSFTP(CCIInteraction.java:862)
at com.sap.aii.adapter.sftp.ra.rar.jca.CCIInteraction.transmit(CCIInteraction.java:446)
at com.sap.aii.adapter.sftp.ra.rar.jca.CCIInteraction.send(CCIInteraction.java:363)
at com.sap.aii.adapter.sftp.ra.rar.jca.CCIInteraction.execute(CCIInteraction.java:315)
at com.sap.aii.af.app.endpoint.ModuleProcessorExitBean.process(ModuleProcessorExitBean.java:206)
at sun.reflect.GeneratedMethodAccessor2163.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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Or

Catching 3: Access denied
at com.jcraft.jsch.ChannelSftp.throwStatusError(ChannelSftp.java:3002)
at com.jcraft.jsch.ChannelSftp._lstat(ChannelSftp.java:2462)
at com.jcraft.jsch.ChannelSftp.lstat(ChannelSftp.java:2438)
at com.sap.aii.adapter.sftp.ra.rar.integration.sftp.SSHConnection.stat(SSHConnection.java:558)
at com.sap.aii.adapter.sftp.ra.rar.jca.CCIInteraction.sendSFTP(CCIInteraction.java:685)
at com.sap.aii.adapter.sftp.ra.rar.jca.CCIInteraction.transmit(CCIInteraction.java:446)
at com.sap.aii.adapter.sftp.ra.rar.jca.CCIInteraction.send(CCIInteraction.java:363)
at com.sap.aii.adapter.sftp.ra.rar.jca.CCIInteraction.execute(CCIInteraction.java:315)
at com.sap.aii.af.app.endpoint.ModuleProcessorExitBean.process(ModuleProcessorExitBean.java:206)
at sun.reflect.GeneratedMethodAccessor2163.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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• SAP Process Integration
• SAP Process Orchestration

PI, PO, SFTP, connection, does not exist, Access denied, stat, lstat , KBA , BC-XI-CON-SFT , Secure File Transfer Protocol Adapter , Problem