403 forbidden, unable to do POST in blog hosted in my server

Hi,

To all the good people here, please see if you can help me in this problem of mine. I am using WP-API and oAuth Server plugin to set up a REST connection from a third party C# application. Below is the code.
While it works perfectly on a blog hosted in a free hosting (16mb.com), it chokes when I start using my own server.
During POST it returns a 403 forbidden error. User not allowed to post. I did some changes to htaccess file as read in different blogs, but somehow it dint work. I tried changing wordpress folder permissions and a few tweaks in the code as well.
I think its a server issue, but can anyone help me identify the root cause and any possible workaround.

Below is the code I am using:

var request = (HttpWebRequest)WebRequest.Create(“mysite/wp-json/wp/v2/posts”);
request.Headers = new WebHeaderCollection();
request.Headers[“Authorization”] = “Bearer ” + list.Token.getToken;
request.Method = “POST”;

string Title = getTitle(file);
string Content = getContent(file);
DateTime datePost = (When.Items[When.SelectedIndex] as ComboBoxItem).Name == “Now” ? DateTime.Now : dt.Value;
var postData = “title=” + Title +
“&content=” + Content +
“&status=publish” +
“&date=” + TimeZone.CurrentTimeZone.ToUniversalTime(datePost).ToString(“yyyy-MM-ddTHH:mm:ss”) +
getSEO(Title,Content);

var data = Encoding.ASCII.GetBytes(postData);
request.ContentType = “application/x-www-form-urlencoded”;
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream())
stream.Write(data, 0, data.Length);
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
var json = JObject.Parse(“{” + JObject.Parse(responseString)[“guid”].First + “}”); // get link of post
MessageBox.Show(“Post posted at “+json[“rendered”].ToString());

https://wordpress.org/plugins/oauth2-provider/