Empty files are getting created at receiver FTP server
I have an Idoc to File scenario where I am sending an XML file to receiver FTP server.
Scenario is working fine but sometimes an empty file is getting generated at receiver FTP server.
I have already selected ignore empty file at receiver channel so issue is not within PI system configuration.
When I checked the message log I can see that almost all the files are getting created successfully without any issues, but
for some files/messages I can see that there are below error logs.
"Transmitting the message to endpoint <local> using connection IDoc_AAE_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: Could not get FTP connection from connection pool (1 connections) within 5,000 milliseconds; increase the number of available connections"
"Exception caught by adapter framework: Could not get FTP connection from connection pool (1 connections) within 5,000 milliseconds; increase the number of available connections."
And after there is again success message log in the same message and it creating a file successfully during that time stamp.
but the third party is sometime receiving empty file which I am not able to find in any trace or log (my file name is SD_timestamp.xml).
Can you please let me know what is the solution and what adjustments FTP server need to do in order to resolve this issue.
Thanks in advance.