I got this following error sometimes I tried to connect the server to read the page data. I had written the following code.
string ReadTextFromUrl(string url)
using (var client = new WebClient())
using (var stream = client.OpenRead(url))
using (var textReader = new StreamReader(stream, Encoding.UTF8, true))
Finally, I identify my network is very slow. Not problem with the code. I am not facing the problem at all time. When the connection getting lost or Service unavailable.
For me no problem with Antivirus, that may block some pages. It is due to network connection lost.