FTP server Connection refused

Hi all,

In the last couple of weeks our PI communication channels keep throwing "FTP connection refused" errors. I already did a lot of searching on this forum, changed many settings, but the error just keeps coming up.

In our scenario we use PI to poll on files with a specific file mask on an external ftp-server. Files that comply to the file mask are transferred and mapped to our SAP MM/SD system, archived and deleted from the FTP-server. This scenario works fine for a couple days. After that I get the error message:

"Error occurred while connecting to the ftp-server "62.50.2.149:21": java.net.ConnectException: Connection refused: connect"

I tried using a ftp-client to connect to the ftp-server from the PI-system, which gave no errors. I also looked into the log on the external ftp-server, which didn't show any connection attempts from the PI system. I also extended the polling intervals, but this only extended the time for the ftp error to return. I also uninstalled the McAfee virusscan.

The only way to correct the error is rebooting the PI system. After the reboot the ftp connection is restored, but after a week the ftp connection refused error is back.

Is anyone familiair with this error and has a solution for this?

Thanks in advance!

Best regards,

Ivo