Disable / Uncheck Internet Protocol Version 6 (TCP/IPv6) and try again. Right click on Cisco anyconnect secure Mobility client connection -> Properties.
Go through the errors, warnings to find more information.
Check Event Viewer on Local machine and go to Application and Services logs -> Cisco Anyconnect Secure Mobility Client.Uninstall Cisco anyconnect –> re-install the latest version from Cisco website and Test again.If it still does not fix the issue after you have gone through below points, then you may have to check the VPN configuration on the Firewall or Server or Router ( whichever device where the VPN setup/config exist) and verify the setup / configuration again. It could be one of the below point or area where the issue exist. However, I can guide through through the areas where you can look at and try to fix this issue. There is no easy fix or straight forward solution of this issue. Re-download Cisco VPN An圜onnect Follow your computer prompts After you select Open Security Preferences, your computers Security & Privacy settings will.
