You might have experienced the exceptionally annoying error with Cisco UCS and the latest update to Java (and apparently the fault is a java programming fault not Cisco UCS) where after trying to login to Cisco UCS you get the following error:
Login Error: java.io.IOException: Invalid Http response
Login Error: java.io.IOException: Server returned HTTP response code: 400 for URL: http://x.x.x.x:443/nuova
Here is a quick and easy work-around to enable HTTP via the SSH command shell, you can then HTTP into the device instead of HTTPS and at least that will get you on there quickly instead of having to stuff around with Java,
naturally I would recommend disabling HTTP since everything is transmitted in clear text once the issue is resolved
UCS# scope system
UCS /system # scope services
UCS /system/services # enable http
UCS /system/services # disable http-redirect
Warning: When committed, this closes all the web sessions.
UCS /system/services* # commit