PutFile Timeout on Core FTP Server (General questions)

I've built some code that I use to automate file transfers to various trading partners. All are working fine until this new one. At the PutFile step I always receive this error:

-2146818228 The current connection has timeout.

The only difference I know of between this trading partner and all others is that this one is using CoreFTP Server. I can connect to his server using FileZilla and transfer files but not through wodFTP code.

Any thoughts on what to look into?

Thank you,
Cliff