unable to logon to hanasvr-03

All,

I was working in the hanasvr-03 and able to create atable and a view for trying. But when I logged back on I could not expend the server, it was showing Invalid userid or password. But i am already in the HANA Studio.If I dbl click the server it is prompting for userid/password for the SAP System host?

Anybody can help? why I get this error or how I can resolve this error?

Thanks in advance.

Arthur.