Please check and share below information, Based on that we can proceed with identifying the issue.
API Gateway logs
Are you able to login to IS? If so navigate to Package–>management and check the status of wmAPIGateway package on whether it is fully loaded or partially loaded? If partially loaded check for errors
Navigate to back end folder \SoftwareAGInstallationDirectory\InternalDataStore\bin and start the elasticSearch by running the batch file.
Are you able to access 5555?
Can you try different outbound port. The one you are using may be in use.
Can you share the details of licensing screen please
This package is must needed for the AGW to come up properly and it’s tightly coupled with IS engine via this package. Please check on both AGW and IS logs if the gateway is running and operational for the mentioned url endpoint access!!