There are separate forums for discussing issues with products still in beta testing.
In analysis though, the log indicates the first two LU attempts were cancelled:
"Received cancellation request at 2013/10/19 10:54:08.372
Received cancellation request at 2013/10/19 11:40:52.081"
While the third attempt fails to detect the proxy server: 10.121.2.192:8080 and fails with a "WinHttp error: 12030". This apparently means:
"The connection with the server has been reset or terminated, or an incompatible SSL protocol was encountered. For example, WinHTTP version 5.1 does not support SSL2 unless the client specifically enables it."
http://msdn.microsoft.com/en-us/library/windows/desktop/aa383770(v=vs.85).aspx
Hopefully, this should point you in the right direction, but I think you're meant to raise this on the beta forums rather than here. It is generally not recommended that you go into production with a beta version of the software.