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SFTP SCP Server; Possibly Not Sending ACK Back to Client; How can I know?

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I have SFTP Server set up on an internal network. Another PC periodically sends text files to it for processing. The software sending the file keeps receiving the following message, from the SFTP server, as told to me by that software's vendor.

 

The client PC can successfully send files to the SFTP server; that is, the files all arrive fine, but the client does not realize the files arrived fine. As such, the files keep re-sending every five minutes, because the client software is set to try every five minutes in the event of a failed transmission.

 

Questions:

  1. Is the example message below truly being sent, by SFTP SCP Server, or is this a message generated by the client that is uploading the files?
  2. Is there an SFTP SCP Server log file somewhere that logs the outbound ACK[nowledgement] records? I am thinking it may be that the software expects some standard response or at least needs to know the syntax of the "File received" message that SFTP SCP Server might be sending back.

Thanks to any and all for any help! My users are getting tired of manually deleting all the duplicate files.

 

I renamed the actual username to 'USERNAME', and the last two octets of the IP address, in the example below. I assume part of the rest of the text is a hashed version of the password.

 

Message:

 

sendFile|MSG:Exception occurred while attempting send the files to the sftp location: 192.168.xx.x USERNAME {3Des}oGxaxqbZ7WJRTgHhi/lLIw==|EX:


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