Created question in FIWARE Q/A platform on 13-05-2019 at 13:05
Please, ANSWER this question AT https://stackoverflow.com/questions/56111033/orion-cb-cant-access-entities-via-v2-entities-endpoint

Question:
Orion CB: Can't Access Entities via /v2/entities endpoint

Description:
While creating a wirecloud wiring using NGSI Source operator, I encountered an error (helpless error) for couple of days, regarding connection to my instance of Orion CB. I can confirm all other NGSI operator settings entered are correct.

Error creating subscription in the context broker server: Connection Error

I however, suspect this error has to do with Orion NOT finding the entities to subscribe the NGSI Source operator. This is because I tried accessing Eindhoven's broker (http://212.159.228.70:1026/) and it works, NGSI Source operator subscription created successfully.

Equally, I get all entities/attributes in the Eindhoven's broker using:

Akil$http http://212.159.228.70:1026/v2/entities
HTTP/1.1 200 OK
Connection: Keep-Alive
Content-Length: 15501
Content-Type: application/json
Date: Mon, 13 May 2019 10:20:20 GMT
Fiware-Correlator: b5e5294a-7568-11e9-83c8-0242ac120003

[
{
"NO2": {
"metadata": {},
"type": "Number",
"value": 27.5
},
"Ozon": {
"metadata": {},
"type": "Number",
"value": 59.5
},
"PM1": {
"metadata": {},
"type": "Number",
"value": 8
},
"PM10": {
"metadata": {},
"type": "Number",
"value": 12
},
.
.
}
]

But then I cannot get the entities in my Orion instance using same scenario:

Akil$ http 193.136.xx.xx:53154/v2/entities
HTTP/1.1 200 OK
Connection: Keep-Alive
Content-Length: 2
Content-Type: application/json
Date: Mon, 13 May 2019 10:36:13 GMT
Fiware-Correlator: ee22e4b2-756a-11e9-afa1-0242ac160007

[]

Return empty list, whereas I have available 2 FIWARE services: environment and urbansense. The entities I want to access are available with the urbansense fiware-service having /basic fiware-servicepath.

Service health:

Akil$ http 193.136.xx.xx:53154/version
HTTP/1.1 200 OK
Connection: Keep-Alive
Content-Length: 345
Content-Type: application/json
Date: Mon, 13 May 2019 10:50:13 GMT
Fiware-Correlator: e32bf3da-756c-11e9-9371-0242ac160007

{
"orion":

}

Questions:

Why can't I access my Orion instance same way I accessed Eindhoven's
broker?
Is this the reason why my wiring for NGSI Source operator
failed, thus reporting subscription error above?