SWG: Web Filter database download issue

it's first implementation, I already configured the DNS, and DGW, and tcpdump didn't show any traffic for public. the issue solved after i configured the download time to starts now and ends after two hours, and disabled the download now and re-enabled it again,

modify sys url-db download-schedule urldb download-now false 
modify sys url-db download-schedule urldb status false 
 modify sys url-db download-schedule urldb download-now true 
modify sys url-db download-schedule urldb status true 

and after the download the two hours the issue happened again,

is that condition to download only between this period?