HCI Package integration EC to WFS error when using the custom mapping iflow

there are 2 iflows. one is the main package and then the second one is the custom mapping iflow.

the main package sends the data to the 2nd iflow for custom logic, however even though the 2nd iflow was successfully called and data has been passed, it gets an error in the main package. Its weird because the 2nd iflow is successfull, but it cannot send the data back to the 1st iflow

error msg:

org.apache.cxf.interceptor.Fault: Could not send Message., cause: java.net.SocketTimeoutException: Read timed out (local port 48580 to address xxxxxx (vsa5099092.syd.od.sap.biz), remote port 443 to address xxxxxx)