error number 421

Just downloaded and trying out latest SmartFTP - very nice, so far!

Uploading large 'My Docs' file to ISP storage. It is all going smoothly, some ten minutes after the msg., so why this warning??

Many thanks Jeff

[16:28:29] 200 NOOP command successful
[16:28:56] SIZE assurance maladie.tif
[16:28:56] 213 10056152
[16:28:56] MDTM assurance maladie.tif
[16:28:56] 213 20081007142856
[16:28:56] STAT assurance maladie.tif
[16:28:56] 211-Status of assurance maladie.tif:
[16:28:56] -rw-r--r-- 1 u34045815 ftpusers 10056152 Oct 7 16:28 assurance maladie.tif
[16:28:56] 211 End of status
[16:29:26] NOOP
[16:29:27] 200 NOOP command successful
[16:29:32] 421 No transfer timeout (600 seconds): closing control connection
[16:29:32] Server closed connection

You can ignore the 421 error. It just means that the server connected the control connection. But your transfers will not be affected by it.