Users behind a Microsoft Proxy receive this error when they connect to the VPN Concentrator via the SSL VPN Client: None of the authentication protocols offered by the proxy server are supported. How is this issue resolved?
A. This error message usually means that the proxy server is configured to use an authentication mechanism that is not supported by the SSL VPN Client. AnyConnect will work in SSL mode via HTTPS proxies (specifically HTTPS 1.1). Additionally, authenticating proxies that use Basic or NT Lan Manager (NTLM) for authorization can also be used. It is recommended to use NTLM when you use the proxy server. Internet Explorer Proxy With the AnyConnect VPN Client If you have Internet Explorer configured with a proxy, you must activate the Use HTTP 1.1 through proxy connections setting to use the AnyConnect VPN Client. If this option is not set, the AnyConnect VPN Client connection does not come up. In Internet Explorer, choose Internet Options from the Tools menu. Click the Advanced tab, and under the HTTP 1.1 Settings, check Use HTTP 1.1 through proxy connections. How does this Internet Explorer setting affect AnyConnect? AnyConnect, like SVC, uses Windows Internet (WinINet) for the pre-tunnel
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