Is the login issue happening only when the proxy is on? We believe the issue may have been related to our triggering additional authentication requests from the Siebel server -- we've fixed this so you should be able to login here, though it may be an issue that they've designed the login for IE only (i.e. no chrome/chromium/epic support?!).
Please do try logging in again with the proxy on and off and let us know if it works.
Thanks as always!
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