The Anyconnect secure mobility client Application Issues
The Anyconnect secure mobility client is behaving oddly. Sometimes it keeps pop-ing in the lower right of my window with the message -Web Authentication Required/You may need to use a browser to gain access" and sometimes when i am trying to open it- it keeps giving me this error, screen shot attached and also get some other type of error, for which too the screenshot attached.
I would look at what ports and/or protocols you are attempting to use when cross the Internet to the remote destination. Are you IPSec, SSL, or a combination?
Next I would run a port scan on the remote VPN endpoint to determine if those ports are open. Your ISP may very well be blocking this type of traffic, may be on purpose or as a result of an upgrade/update on their equipment.
This concept seemed to have helped regarding the issue-
Captive Portal Hotspot Detection
•The service provider in your current location is restricting access to the Internet. The AnyConnect protection settings must be lowered for you to log on with the service provider. Your current enterprise security policy does not allow this. If AnyConnect detects the presence of a captive portal and the AnyConnect configuration differs from that described above, the AnyConnect GUI displays the following message once per connection and once per reconnect: The service provider in your current location is restricting access to the Internet. You need to log on with the service provider before you can establish a VPN session. You can try this by visiting any website with your browser. Captive portal detection is enabled by default, and is non-configurable. AnyConnect does not modify any browser configuration settings during Captive Portal detection.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...