Smart FTP stops after quite exactly 10 minutes.

User ID : 400006900

I am exporting some SETUP files of app. 25 - 40 MB in size over an ADSL line, which works with 50 - 55 kb/sec.
That means, that the larger setups uses +10 minutes to finish.
After 10 minutes i get this message:
En ikke-blokerende sockethandling kunne ikke gennemf