Configuration Error Secure Admin must be enabled to access the DAS remotely

Go to http://159.203.15.193:4848/ entered u:admin p: admin123 error Configuration Error
Secure Admin must be enabled to access the DAS remotely

Try 1 based on this link

root@ubuntu-s-1vcpu-2gb-tor1-01:~/iuclid6/iuclid6-server-6.8.0/glassfish4/bin# ./asadmin --port 4848 enable-secure-admin

Enter admin user name> admin

Enter admin password for user “admin”>

remote failure: NCLS-SECURITY-05200 : org.jvnet.hk2.config.TransactionFailure: Constraints for this JmxConnector configuration have been violated: on property [ port ] violation reason [ must be between 1 and 65535, or reference a system property using the form ${SYSTEM_PROPERTY_NAME} ]

Constraints for this JmxConnector configuration have been violated: on property [ port ] violation reason [ must be between 1 and 65535, or reference a system property using the form ${SYSTEM_PROPERTY_NAME} ]

Tried many other similar ways, all of them give the same error.