To find the potential problem :
Keep reading the logs in the following file in the HCC folder : .....logs\ljs_trace.log
To look at the latest logs, you can delete all previous logs and save the log file before triggering go.bat
Look at the logs with the time stamps of launching the go.bat
Problem Scenario 1: You downloaded and extracted the Hana Cloud Connector developer version (from https://tools.hana.ondemand.com/#cloud)but You keep getting the ERR_CONNECTION_REFUSED instead of the login page.
Potential Resolutions :
1). http instead of https ?
The right link is https://localhost:8443
And NOT http://localhost:8443/
Default username is "Administrator" and password is "manage".
2). JDK 64 bit is not installed correctly
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
Ensure that you install the 64 bit version and typing java -version on command promt responds after the installation. Ensure you set JAVA_HOME and PATH environment variables.
3). Visual Studio 2010 runtime libraries not installed in the correct version. (vcredist.msi)
The 64bit msi can be downloaded from http://www.microsoft.com/download/en/details.aspx?id=14632
4). Resolved 1, 2 & 3 but still not working
If you confirmed step 1 and 2 for sure, just re-extract it again in another folder and execute go.bat
Problem Scenario 2: The logon page turned up but when you try add your Hana Cloud Platform trial accoutn you get a error message "Configuration XML was not updated"
Potential Resolution : Restart the Hana Cloud Connector
In my case these steps solved my problem. Do let me know if you faced another problem situation, I will be happy to update the blog to add your situation and solution as well.
Miscellaneous
Quite some discussion here about Scenario 1:
https://scn.sap.com/thread/3542457
Scenario 2 :