how to auto retry??

I always get server time out when i downloading from that server. However i am not disconnected. All i have to do is just click on the file to download resume again

Are there any automatic way to do this?

Using global queue for example, select the file/s press control+z and start the queue.

does golbe quene counts as another log in??
Because if i have log in to the ftp, when i add it to globe queue then the globe queue can not log in because the FTP only allow one log in per ip.

Yes. You must close the ftp before starting the queue.