Now that you know every potential scenario that might be responsible for the apparition of the ‘ Connection attempt failed‘ error, here’s a list of verified methods that other users have successfully deployed in order to bypass the error message: 1. In this case, you can fix the issue by making some changes via the Registry Editor.

Internet Explorer is configured to Work Offline – Since Cisco An圜onnect and IE share some common functionality, you can expect to see this error in those situations where IE’s offline mode is enabled by default.

If this scenario is applicable, you should be able to fix the problem by disabling the network connection sharing from the Network Connections tab.

Connection Sharing is Enabled – As it turns out, you can also expect to see this error code popping up due to a network sharing functionality that interferes with Cisco An圜onnect.

If you find yourself in this scenario, you should be able to resolve the issue by disabling Hyper-V prior to launching the application.

Hyper-V Conflict on Windows 10 – It’s a well-known fact that Hyper-V is known to conflict with a lot of VPN facilitators such as Cisco An圜onnect and this scenario is no exception.

In this case, you can resolve the issue by uninstalling and hiding the problematic update with a specialized utility.

Error caused by Windows Update KB 3034682 – If you find yourself in a scenario where the issue suddenly started to occur after WU installed update KB 3034682, chances are the update contains a problematic security rule that is interfering with Cisco An圜onnect.

In this case, you should be able to resolve the issue by forcing the vpnui.exe file to open in compatibility mode with Windows 8.

Incompatibility with Windows 10 – According to a lot of Windows 10 users, you can expect to see this problem occurring due to an incompatibility affecting the SSL/TLS API that inhibits the Cisco An圜onnect tool from communicating with an outside server.

Several affected users have managed to fix the issue by installing every pending update in order to resolve the inconsistency with the TLS protocol renegotiation and fallback behavior.

Missing Hotfix for TLS Protocol Renegotiation – As it turns out, there are a couple of updates with the potential of causing issues with Cisco An圜onnect.

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