The Yellowfin DB connection details are stored within the web.xml file, located in :
Yellowfin/appserver/webapps/ROOT/WEB-INF/

Please confirm the information under 'Initiate JDBC Connection Pooling - Setup/Configuration' is correct (see below).

[code]
param-name>JDBCDriverClass
com.microsoft.jdbc.sqlserver.SQLServerDriver[color="#FF0000">Database Driver[/color]


JDBCUrl
jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=Yellowfin[color="#FF0000">Database URL[/color]


JDBCUser[color="#FF0000">User account used to connect to the database[/color]
sa


JDBCPassword
cDahEHuTOrk=


JDBCPasswordEncrypted[color="#FF0000">By default the password is encrypted[/color]
true
cDahEHuTOrk=


JDBCPasswordEncrypted
true [/code]

By default the JDBC password is encrypted, if you would like to change the password, please see the post below:
Changing the JDBC user password in the web.xml file