now squid is working as transparet but unable to block internet download manager to stop donloading the file. need help
Since, IDM and some other Download Manager software use 80 port, I don't know any other way without using a firewall/filter appliance that does Transport Layer level Deep Packet Inspection by which filtering is possible reading inside of the data packet being sent.
For the time being, you can restrict IDM downloaders with blocking domains in squid if they download frequently from any specific/common sites until any Guru can show us any precise way.
Thanks a lot.