Here's the scenario:
ASA5510 security plus running v8.0(4) and v6.1.(5)51 ASDM; has two default WebVPN licenses.
I'm demonstrating AnyConnect client to a customer. The customer has a proxy server that all outbound connectivity goes thru. I connect to the ASA to install the AnyConnect client v2.3.0254, credentials are authenticated and then the proxy server asks for credentials the local domain - no one knew what they were to begin with so we tried guessing a few times. After the second connection try I then got the msg that the the authentication credentials were no good - ie username/password failed. I checked the ASA and found both of the default Clientless SSL VPN connections were active. Once I logged out those connections I could then reconnect and with the correct local domain credentials was able to make an AnyConnect connection which I could then disconnect afterwards.
Do I have a config error, an IOS bug or a feature??