ECONNRESET error on http nodejs

I'm trying to make a simple http request to a rest API via http library on nodejs. Two minutes after the call, the request triggers this error:

{ [Error: read ECONNRESET] 
code: 'ECONNRESET', 
errno: 'ECONNRESET', 
syscall: 'read' }

The server is working because when I do this call with PHP or using Chrome's extension Advanced Rest Client it works. I don't have access to server logs or server configurations.

I'm almost sure that my call is reaching the server, because with a wrong address, I get an incorrect address error and with a different port, I get a timeout error.

var http = require('http');

var post = {
    "id": msgId,
    "otherdata": { "user": user } 
};
var content = JSON.stringify(post);

// prepare the header
var postheaders = {
    'Content-Type' : 'application/x-www-form-urlencoded',
    'Content-Length' : Buffer.byteLength(content, 'utf8'),
    'Accept-Encoding': 'gzip,deflate,sdch',
    'Accept-Language': 'en-US,en;q=0.8'
};

// the post options
var optionspost = {
    host : Constants.API_HOST,
    port : Constants.API_PORT,
    path : Constants.API_PATH,
    method : 'POST',
    headers : postheaders
};

// I found a solution that recommended adding the following code, but it didn't work either:
var keepAliveAgent = new http.Agent({ keepAlive: true });
optionspost.agent = keepAliveAgent;

// do the POST call
var request = http.request(optionspost, function(res) {
    res.on('data', function(d) {
        // never reached here
        console.info(data);
    });
    res.on("end", function(){
        // never reached here also
        console.info(data);
    });
});
request.write(content);
request.end();
request.on("error", function(e){
    // ECONNRESET error is triggered here...
    console.info(e);
});

I was thinking that it may be some incorrect usage of node's http library, so I was thinking about using another library for rest API calls.

Suggestions anyone?

Thanks! =)