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Cisco VPN error 412 will occassionally occur when using the Cisco VPN client.
The exact error message may differ between versions of the Cisco VPN client, but will be similar to this:
Error Secure VPN Connection terminated locally by the Client. Reason 412: The remote peer is no longer responding.
Causes for Cisco VPN Error 412
There are many causes of error 412, including:
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Poor network connection.
Packet delay or loss can force the VPN session to drop.
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Hardware failure in a network interface card or network device.
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A
firewall or ACL (Access Control List) is blocking required protocols or ports:
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For PPTP,
IP
protocol 47 and TCP port 1723 are required
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For IPSec, IP protocol 51 and UDP port 500 are required
Troubleshooting Tips
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If it is wirelessly connected then try to connecting it with cable
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Turn the installed firewall off. Test the connection to see whether the problem still occurs. If it doesn’t then you can turn your firewall back on, add exception rules for port 500, port 4500 and the ESP protocol in your firewall
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Turn on NAT-T/TCP in your profile (remember to unblock port 10000 in your firewall or turn the firewall off temporarily)
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Edit the profile with an editor and change ForceKeepAlive=0 to ForceKeepAlive =1
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Discuss Cisco VPN Error 412 in the forums.
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