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Cisco Bug: CSCvv66700 - Low VPN tunnel throughput on macOS BigSur with AC Socket Filter app

Last Modified

Oct 08, 2020

Products (1)

  • Cisco AnyConnect Secure Mobility Client

Known Affected Releases


Description (partial)

When AC4.9.02028 is installed on macOS11 the AC Socket Filter app is automatically installed and as long as it is running on the client, with or without VPN tunnel being connected, low internet speed is experienced.

Install AC 4.9.02028 on macOS 11 and connect to iperf server to test the uplink and downlink speed.
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