R12.2 Cannot Start Weblogic Managed Servers On DMZ Node After Cutover.

fails with 'Authentication denied: Boot identity not valid;' in oacore_server.log
Following is the error in oacore_server.log and oafm_server.log
weblogic.security.SecurityInitializationException: Authentication denied: Boot identity not valid; The user name and/or password from the boot identity file (boot.properties) is not valid. The boot identity may have been changed since the boot identity file was created. Please edit and update the boot identity file with the proper values of username and password. The first time the updated boot identity file is used to start the server, these new values are encrypted.
at weblogic.security.service.CommonSecurityServiceManagerDelegateImpl.doBootAuthorization(CommonSecurityServiceManagerDelegateImpl.java:960)
at weblogic.security.service.CommonSecurityServiceManagerDelegateImpl.initialize(CommonSecurityServiceManagerDelegateImpl.java:1054)
at weblogic.security.service.SecurityServiceManager.initialize(SecurityServiceManager.java:873)
at weblogic.security.SecurityService.start(SecurityService.java:141)
Note: Added DMZ node to application by following Note 1375670.1
Solution:
1. Check the firewall port configuration for the instance.
2. Confirm whether the required ports are open for the server reporting the issue.
3. If the required ports have not been opened, opening the port should resolve the issue.