I HAVE THE SAME PROBLEM

I Have 3 diferents Errors:

1. Maestro Error:
   There was an error connecting with Maestro. League of Legends
   will now exit. Please try restarting the application.
2. Microsoft Internet Explorer
   The launcher has experienced an error.Please restart this application.
3. (mx.messaging.messages::ErrorMessage)#0
   body = (null)
   clientId = "35E04521-3908-C032-97E5-8D047F7EE76A"
   correlationId = "8A369586-580B-1DB1-C5B2-8A64D19C1007"
   destination = "practiceGameService"
   extendedData = (null)
   faultCode = "Server.Processing"
   faultDetail = (null)
   faultString = "org.springframework.security.AuthenticationCreden tialsNotFoundException : An Authentication object was not found in the SecurityContext"
   headers = (Object)#1
   messageId = "35E045A7-800D-99F2-328B-15A1D8420264"
   rootCause = (Object)#2
   authentication = (null)
   cause = (null)
   extraInformation = (null)
   localizedMessage = "An Authentication object was not found in the SecurityContext"
   message = "An Authentication object was not found in the SecurityContext"
   mostSpecificCause = (Object)#2
   rootCause = (null)
   timestamp = 1256452317056
   timeToLive = 0

WHAT I NEED TO DO?

Having the same issue... Bump

bump

still have no answer to this problem

i have read them multiple times and i am still getting the same problems, even after multiple installs.

I believe that my internet connection is fine. If I'm correct doesn't the launcher have to run alongside maestro to run properly?

Well in my case as I push the play button to start the game I receive a skinned.launcher Windows error that then closes the program, but the login screen still comes up. after that I soon get the maestro error. To add to that I downloaded the standalone client yesterday and nothing changed. And yes I am running it as admin, disabled the firewall, opened all the listed port needed and still nothing.

Please more suggestions!