What is nesessionmanager?

nesessionmanager often appears alongside VPN-related processes in Activity Monitor.

What is nesessionmanager?

nesessionmanager stands for Network Extension Session Manager. It manages active sessions for network extensions, the modern framework that VPN apps, content filters, and other network tools use on macOS.

What does it manage?

nesessionmanager looks after:

• Active VPN tunnel sessions
• Content filter sessions
• DNS proxy sessions
• App proxy sessions

When you connect to a VPN using a modern macOS VPN app, nesessionmanager manages the life of that connection: starting, keeping, and stopping the tunnel.

Why is it always running?

Even if you are not connected to a VPN, nesessionmanager stays running if you have any network extension setups installed. It needs to be ready to start sessions when asked.

Does it use many resources?

No. It is light and mostly waits for network extension events. Resource use goes up a little while a VPN or other network extension session is active.

Should you worry?

No. It is a normal macOS system process. If you see it and do not use any VPN or network extension apps, check System Settings, then VPN and System Settings, then General, then Login Items, then Extensions for any installed network extensions.

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