How do I find out which application is using the internet?

Possible solutions

Choose the method that matches your situation. Start with the simplest suitable option and check the result. If the problem is fixed, you do not need to continue with the other methods.

1. Task Manager Network

   Compare the network load in the process list and temporarily pause known downloads.

   Steps to follow

   1. Press Ctrl, Shift and Esc together to open the Task Manager.
   2. If you only see a short list of apps, click More info if available.
   3. In the list of processes, click "Network" so that the most active ones are at the top.
   4. Pause a known download or sync in its own app.
   5. Repeat the connection test and compare; do not terminate unknown system processes.

2. Resource monitor

   Use Win+R > resmon > Network for a more detailed view of processes and connectivity.

   Steps to follow

   1. Press Windows and R, type resmon and Enter.
   2. Select the Network tab.
   3. In the Processes with network activity list, compare receiving and sending. Pause a known program on it, not the entire system network.