By applying recent CPU patches on Oracle E-Business suite R12.2, many customers faced issues while accessing weblogic admin console from browser.
This security enhancement started with the April 2019 CPU via Patch using weblogic connection filters.
By applying the patch the weblogic connection filters are turned ON and lets only localhost access the URL and denies all other client hosts. The following values in $EBS_DOMAIN_HOME/config/config.xml are responsible for these changes:
<connection-filter-rule>localhost * * allow</connection-filter-rule>
<connection-filter-rule>0.0.0.0/0 * * deny</connection-filter-rule>
Remove these lines from the $EBS_DOMAIN_HOME/config/config.xml fike try accessing the weblogic.