How to Enable DEBUG Logging for FTP, SFTP and FTPS Connectors for Mule Applications

Refer to How to Set the Log Level for a Mule Application in Different Environments to enable DEBUG logging for the following package:

FTP 

<AsyncLogger name="org.mule.transport.ftp" level="DEBUG"/>
<AsyncLogger name="com.mulesoft.mule.transport.ftp" level="DEBUG"/>

<AsyncLogger name="org.mule.extension.ftp" level="DEBUG"/>

SFTP

Mule 3

<AsyncLogger name="org.mule.transport.sftp" level="DEBUG"/>
<AsyncLogger name="com.jcraft" level="DEBUG"/>

Mule 4 (up to version 1.6.3 of the connector)

<AsyncLogger name="org.mule.extension.sftp" level="DEBUG"/>
<AsyncLogger name="com.jcraft" level="DEBUG"/>

Mule 4 (as of version 2.0.0 of the connector)

<AsyncLogger name="org.mule.extension.sftp" level="DEBUG"/>
<AsyncLogger name="org.apache.sshd" level="DEBUG"/>

FTPS

<AsyncLogger name="com.modus.mule.modules.ftps" level="DEBUG"/>
<AsyncLogger name="com.mulesoft.connectors.ftps.internal" level="DEBUG"/>

Mule 4

<AsyncLogger name="org.mule.extension.ftp" level="DEBUG"/>
<AsyncLogger name="com.mulesoft.extension.ftps" level="DEBUG"/>

Note: The debugging package for the FTP Connector also needs to be enabled as shown above because the FTPS Connector connects to FTP servers as FTP Connector and just adds support for Transport Layer Security (TLS).

If you would like to troubleshoot connection management issues with the connection pool, enable debug logging for the following package:

org.mule.runtime.core.internal.connection