Unable run my test file when I have increased the num of users

[seshendramln]

Hi In my test file when I increase the num of users I was getting the warning that "WARN: Error during HTTP request: Error: ECONNREFUSED, Could not contact DNS servers" and Iam unable rectify the problem so please help me in solving this error.

nl.run({ name: "test", host: 'http://91.123.195.57/', port: 9200, numUsers: 2000, //Increased my num of user timeLimit: 180, targetRps: 500, stats: [ 'result-codes', { name: 'latency', percentiles: [0.9, 0.99] }, 'concurrency', 'rps', 'uniques', { name: 'http-errors', successCodes: [200,404], log: 'http-errors.log' } ],