HANA Studio Disconnected after a while

Dear All,

I have just successfully upgraded the AWS HANA developer edition from rev 48 to rev 56 by following the guideline http://scn.sap.com/docs/DOC-30980.

I have also upgraded the HANA studio to version 56 from the source installer in dir /sap/update. Initially I was able to connect to the HANA DB, I could see the green light of the icon, and could also see all the tables and etc. But then after a while, it was disconnected. I closed the HANA Studio, and opened again, tried to add the new system, and the same thing happened again; successfully connected then disconnected after a while. I checked the error log, there is this message "Database connection is not available".

Detail error log

What could be the problem here? I'm runnning the HANA Studio on a 64-bit windows 8 from my home network. There is no special restriction in my home network, meaning that all ports are open.

Please advise. Thank you.

regards,

Idi Kurniawan