Openconnect on Ubuntu 64-bit: Can't connect to Cisco VPN

Openconnect on Ubuntu 64-bit: Can't connect to Cisco VPN

I am trying to use OpenConnect on Ubuntu 64-bit to connect to a Cisco VPN
as an alternative to the AnyConnect software.
I am running Ubuntu Linux 64-bit 13.04.
I am not able to get the connection working. The Openconnect log output
shows the following content over and over again in a loop apparently
without end:
Connected to HTTPS on vpn.mycompany.com
GET https://vpn.mycompany.com/+CSCOE+/sdesktop/wait.html
Refreshing +CSCOE+/sdesktop/wait.html after 1 second...
SSL negotiation with vpn.mycompany.com
Connected to HTTPS on vpn.mycompany.com
GET https://vpn.mycompany.com/+CSCOE+/sdesktop/wait.html
Refreshing +CSCOE+/sdesktop/wait.html after 1 second...
SSL negotiation with vpn.mycompany.com
and so on and on.
Does anyone have any suggestions about what the solution to this problem
is? I have enabled use of the Cisco Secure Desktop Trojan in the VPN
configuration.
Any help gratefully received.