I have a managed Linux server with 1&1, but the FTP connection speeds are very slow, sometimes the file transfers even fail.

When using FTP on another 1&1 server it is works fine.

If I reboot my ADSL Modem/Router the FTP connection is then very fast, and then gradually slows.

What I am trying to figure out is if it is a problem with the 1&1 server or my ISP.