request.GetResponse() has giving “The operation has timed-out.” in vb.net

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VB

I'm facing problem in getting response for a POST method web request in vb.net and the GET request is working properly and getting the response, while the same request is working fine in C# with the same steps followed here. So, can any one help me to try to sort out this

Here Url is a Elastic search engine and the data in postData variable is a json string and the response will also be is a json string

Dim request As System.Net.HttpWebRequest = System.Net.HttpWebRequest.Create("HOSTIP:9200/es5078_1/_search?pretty=true")

request.Method = "POST"
Dim postData As String = CGeneral.gstrMsgNC(236)
request.ContentType = "application/x-www-form-urlencoded"
request.ContentLength = postData.Length
request.Timeout = 100000

Dim writer As StreamWriter = New StreamWriter(request.GetRequestStream())
writer.Write(postData)
request.Expect = ""
request.AllowAutoRedirect = True
request.AllowWriteStreamBuffering = True

Dim response As System.Net.HttpWebResponse = request.GetResponse()

Dim responseReader As StreamReader = New StreamReader(response.GetResponseStream())
Dim result As String = responseReader.ReadToEnd()