The phoenix.properties file is a properties file for the Portal. It comes as a template _phoenix.properties in the DEVTEST_HOME folder. Looks like this:
#registry.host=localhost
#registry.port=2009
#registry.portal.port=1505
#registry.https.enabled=true
#phoenix.port=1507
#phoenix.https.enabled=true
#phoenix.ssl.keystore=${LISA_HOME}/webserver.ks
#phoenix.ssl.keystore.password={cry}8b923091e33484e01de2c25a3a7a770b
#phoenix.ssl.keymanager.password={cry}8b923091e33484e01de2c25a3a7a770b
#reshub.hostname=localhost
I would uncomment the below line:
registry.host=<put your Registry IP here>
reshub.hostname=<put your Portal IP here.
Restart Portal. Just curious to see if this helps.