Enterprise Manager is not able to connect to the database instance

Today i got this message from OEM, “Enterprise Manager is not able to connect to the database instance. The state of the components are listed below.” I have search the solution that help me to fix this problem, - first, check DBSNMP, SYSMAN, and SYS not locked and password value is ok. default password for DBSNMP is DBSNMP, SYSMAN is SYSMAN, SYS is MANAGER or CHANGE_ON_INSTALL. to ensure the correct password, it is better to alter it with new password. - emca -deconfig dbcontrol db Database SID : [...]

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