Thanks for the info. We've identified a bug where users will sometimes see the 401 errors when they attempt to login, even when they provide the correct username and password. We have a fix for the bug which is in testing right now. We'll update Falcon as soon as it passes. In testing, we see the 401's intermittently. Usually if we attempt to login a few times it will succeed. I haven't seen it happen consistently, as you describe. It happens for a known reason, when the random values used in SRP have certain properties. Thus it's random; you might never see it, or you might see it a few times in a row. In theory, you could see it every time, but it's highly unlikely. I'd recommend you retest after we fix the known bug, and if it's still not working we can try to reproduce what you're seeing. Thanks for your patience during the beta. EDIT: A fix for the 401 issue was pushed to Falcon this afternoon (2010-03-01). You should no longer see 401's except in cases where the username or password is actually incorrect. If you continue to see the issue, please clear your browser cache. If you still see it after that, let us know and we'll look into your case further.