Recently users complained about the CISCO VPN Error 412 while trying to make a Remote Access VPN work in the Cisco ASA 5505 firewall section. It was seen that the VPN had been working at only single point but was used in rare cases. Well, even when users were trying to use it repeatedly, they continued to face this error. But this problem surely has solutions that were discovered by a team of Cisco Router Support Number experts.
Causes of Cisco VPN error 412
There lies wide number of reasons of Cisco VPN error 412 and they are listed below:
- Firewall on the client side which may be blocking various un-necessary UDP or TCP ports
- The error may be the reason of unstable internet connection such as a mobile connection. But normally, it’s due to a configuration issue on the firewall itself.
Uses of VPNs
VPN stands for Virtually Private Network and it has two most primary uses:
- The VPN network enhances the security of data
- It do shares data and various installed applications on the system
Steps to Fix Cisco VPN Error 412
Step 1 – Use of Ethernet
It is recommended by Cisco Router Technical Support professionals users must try to connect by using an Ethernet or even USB connection if the client computer is connecting to the Internet with the help of WiFi connection. The process will further help in eliminating the possibility of WiFi connection where it is not providing sufficient connectivity.
Step 2 – Turn off the computer
Temporarily turning-off the computer’s firewall is highly recommended and then test the VPN connection thoroughly. If you see that the 412 error no longer occurs, then the cause of the error may be due to adding the firewall exception rules for the ESP protocol, port 500, and port 4500.
Step 3 – Turn on the NAT-T/TCP
Enable the connection of NAT-T/TCP option in your profile to ensure that the port 10000 is totally unblocked in the computer’s firewall.
Step 4 – Working with the ForceKeepAlive
Updating of the “ForceKeepAlive=0 to 1 in your own profile is highly recommended.
Step 5 – Changing the computer firewall settings
If you find that the VPN continues to throw an error 412, then changing the computer firewall settings to allow or permit UDP ports 500 and 62515 is essential to be done by users, required for the Cisco VPN client.
Step 6 – Checking the data packets
Ensure that the Cisco VPN client is sending the data packet accurately.
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