To fix Cisco IPSec VPN Client Issue in UAE, you need to do the following: Users reported Failed to initialize connection subsystem error on their PC while trying to use Cisco VPN software, but you can easily fix this problem simply by adding one value to your registry.īefore we start changing the registry, we have to warn you that modifying the registry can lead to all sorts of problems, therefore it’s recommended that you create a backup of your registry before you continue.