Core issue
The error can appear due to these reasons:
Resolution
If this error is due to the presence of bugs then:
For Cisco bug ID CSCsg03979:
- Disable any other network adapters on the machine.
- Use split-tunneling instead of local LAN. In this case you have to know the local LAN subnet.
- Do not include split-tunneling routes in the configuration that conflict with existing routes on the client PC.
Then reconfigure the split tunnel Access Control List (ACL) from extended to standard.
Refer to Configuring SSL VPN Client for additional help on how to configure the Secure Socket Layer (SSL) VPN Client with the Command Line Interface (CLI).