What should I do if Oracle em cannot be opened?

As an Oracle database administrator, you may encounter some common problems, such as Oracle EM cannot be opened. If you are encountering such a problem, this article will provide some possible solutions to the problem.

First, we need to determine if Oracle EM is actually installed and running. This can be determined by checking the status of the WebLogic Server used by Oracle EM. If WebLogic Server does not start, Oracle EM will not start either. Please do the following to check the status of WebLogic Server:

1. Open the Command Prompt or Terminal application.
2. Navigate to the WebLogic Server installation directory. By default this will be located at "%ORACLE_HOME%\user_projects\domains\base_domain".
3. Run the following command:

Windows: startWebLogic.cmd

Linux/Unix: startWebLogic.sh

If WebLogic Server has already started, please Try restarting Oracle EM and check if it still fails to open. If it still cannot be opened, please consider the following solutions:

1. Check the configuration file of EM

The configuration file of Oracle EM is located in the following directory:

Windows: %ORACLE_HOME%\user_projects\domains\base_domain\config\fmwconfig\servers\EMGC_OMS1

Linux/Unix: $ORACLE_HOME/user_projects/domains/base_domain/config/fmwconfig/servers/EMGC_OMS1

You can try to delete all cache and temporary files, and then restart Oracle EM.

2. Check Firewall Settings

If you have a firewall on your server, you may need to open certain firewall ports to allow Oracle EM to function properly. The following ports need to be opened:

Port: 7001
Protocol: TCP

Port: 4889
Protocol: TCP

Port: 1157
Protocol: TCP

Port: 1521
Protocol: TCP

Port: 3872
Protocol: TCP

If the port is already open, please check if the configuration is correct or if it is possible Blocked by other rules.

3. Check the Java version of EM

Oracle EM must use Java SE Development Kit 8 (JDK 8) to work properly. If your system has a different version of Java installed, Oracle EM may not start. Please make sure you have JDK 8 installed on your system and configured as the default Java version.

The above are some reasons and solutions that may cause Oracle EM to fail to open. Hopefully, this information will help you resolve issues like this as quickly as possible.

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