Backup service is unavailable with custom port

Created external machine through aws for windows.

Executed:

couchbase-cli setting-alternate-address -c 172.31.4.235:9000 -u Administrator -p password --set --node 172.31.4.235:9000 --hostname ec2-52-40-249-52.us-west-2.compute.amazonaws.com --ports mgmt=9000,n1ql=9050,kv=2000,capi=3000,fts=5000,cbas=6000,eventingAdminPort=7000,eventingDebug=8000,backupAPI=4000

To access custom ports followed steps from: https://docs.couchbase.com/server/7.0/install/install-ports.html#map-custom-ports 

that is added custom ports in static config file:

{rest_port, 9000}

.

{query_port, 9050}

.

{capi_port, 3000}

.

{fts_http_port, 5000}

.

{cbas_http_port, 6000}

.

{eventing_http_port, 7000}

.

{eventing_debug_port, 8000}

.

{cbbs_port, 4000}

.

{memcached_port, 2000}

.

Delete config.dat and configure it again.

Access the web console and navigated to Backup service.

Service unavailable error observed.