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This error message implies that if you want to use the Always-On feature, you need a valid sever certificate configured on the headend. Without a valid server certificate, this feature does not work. Strict Cert Mode is an option that you set in the AnyConnect local policy file in order to ensure the connections use a valid certificate. If you enable this option in the policy file and connect with a bogus certificate, the connection fails.

Error: "Connection Attempt Failed"

This Diagnostic AnyConnect Reporting Tool (DART) shows one failed attempt:

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Date : 03/25/2014
Time : 09:52:21
Type : Error
Source : acvpnui

Description : Function: CTransportWinHttp::SendRequest
File: .\CTransportWinHttp.cpp
Line: 1170
Invoked Function: HttpSendRequest
Return Code: 12004 (0x00002EE4)
Description: An internal error occurred in the Microsoft
Windows HTTP Services
*****************************************
Date : 03/25/2014
Time : 09:52:21
Type : Error
Source : acvpnui

Description : Function: ConnectIfc::connect
File: .\ConnectIfc.cpp
Line: 472
Invoked Function: ConnectIfc::sendRequest
Return Code: -30015443 (0xFE36002D)
Description: CTRANSPORT_ERROR_CONN_UNKNOWN
******************************************
Date : 03/25/2014
Time : 09:52:21
Type : Error
Source : acvpnui

Description : Function: ConnectIfc::TranslateStatusCode
File: .\ConnectIfc.cpp
Line: 2999
Invoked Function: ConnectIfc::TranslateStatusCode
Return Code: -30015443 (0xFE36002D)
Description: CTRANSPORT_ERROR_CONN_UNKNOWN
Connection attempt failed. Please try again.

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Also, refer to the event viewer logs on the Windows machine.

Solution

This could be caused due to a corrupted Winsock connection. Reset the connection from the command promt with this command and restart your windows machine: