Re: *** ERROR => Connect to database failed, rc=1, rcSQL=10 SQLERRTEXT : invalid username or password "

It's really easy.

Once you have changed the user password via Hana Studio, you must update the info at userstore via hdbuserstore like this:

/usr/sap/<SID>/hdbclient/hdbuserstore SET DEFAULT <host>:3<instance NR>15 <USER> <PASSWORD>