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I am tired to find solution about nsurlsessiond. It's used my 2GB Data daily. I am also tried bellow link. Because of that i am not able to complete my company work. Please any one help. I am also try to find answer in bellow link, but non of these working in my case.
I am getting this while on click nsurlsessiond.
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Open Terminal from the Utilities list and type the following command: sudo kill -9 [PID of trustd], where the part in brackets is the number you determined in the previous step. Press the Enter key. This will terminate the parent process for nsurlsessiond.
What is nsurlsessiond on Mac? Nsurlsessiond is an iCloud-related process that your system uses to communicate with the cloud and sync data. In other words, whenever iCloud data is updating, you can bet that nsurlsessiond is actively running in the background.
Open the Activity Monitor app and navigate to the Network tab, then sort by Rcvd Bytes and wait (the network tab only display cumulative results since you navigated to the tab). Here you will likely see nsurlsessiond topping the list.
I fix it by disabling Software Updates.
Go to System Preferences -> Software Update
Click on Advanced... and uncheck "Check for Updates"
Edit
I had this issue again recently but only when i opened the iOS simulator. I don't know what's the problem but the simulator will use internet for about 500MB and back to normal. Either you can wait until simulator stops downloading or just block the url using firewall as @Lutze explained
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The main problem is that any application can delegate transfers to the NSURLSession Daemon. As a workaround you could use an application firewall like Little snitch to detect and block the specific domain where the traffic comes from.
In my case it was "osxapps.itunes.apple.com" that took a lot of bandwidth.
Screenshot of little snitch with the blocked domain
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