Atlassian Connect Express: Unable to store tenant data in mongodb

[Sarthak Srivastava]

I am creating a JIRA add-on using atlassian-connect express framework and for production environment i want to attach a database to store tenant details which is generated when the add-on is installed in the cloud instance of JIRA.

I have create mongodb instance in azure and got the URL. I have also installed following npm packages:

 "jugglingdb-mongodb": "^0.2.0" ,

 "mongodb": "^3.0.7",

config.json file

"store": { "adapter": "jugglingdb", 
"type": "mongodb", 
"url": "mongodb://my2db:********@my2db.documents.azure.com:10255/?ssl=true" }

app.js

var mongoClient = require("mongodb").MongoClient;

mongoClient.connect("mongodb://my2db:********@my2db.documents.azure.com:10255/?ssl=true"

, function (err, db) { // db.close();}); 

While installation i am getting below error:

The add-on host did not respond when we tried to contact it at "https://723c7g37.ngrok.io//installed" during installation (the attempt timed out). Please try again later or contact the add-on vendor.

What else i need to do to make it working? Please help me here.