You may want to change host name that IQ database and SAP IQ Cockpit ware installed. When you changed host name to new one, IQ database and SAP IQ Cockpit would start fine.
However you may not able to login to SAP IQ Cockpit with error "Login failed" even if you specify correct UserName and Password.
You will find the below error in agent.log file under $SYBASE/COCKPIT-4/log (%SYBASE%\COCKPIT-4\log).
[INFO ] [security.IQLoginModule] [RMI TCP Connection(13)-127.0.0.1] - Validating credentials
[ERROR] [security.IQLoginModule] [RMI TCP Connection(13)-127.0.0.1] - java.sql.SQLException: JZ006: Caught IOException: java.net.UnknownHostException: OLD_HOSTNAME
[ERROR] [security.IQLoginModule] [RMI TCP Connection(13)-127.0.0.1] - Login failed
SAP IQ 16.0 SP08 or later
Validating credentials, java.sql.SQLException, JZ006, java.net.UnknownHostException, hostname , KBA , BC-SYB-IQ , Sybase IQ , How To
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