Pub nub error when a notification comes using c# SDK

When trying to login using c# SDK we are receiving the below error, it was working couple of hours back. below is the error. Please help Severity=Warn MessageSource=Client IsDotNetException=True Message=The remote name could not be resolved: ' pubsub.pubnub.com' DetailedDotNetException=System.Net.WebException: The remote name could not be resolved: ' pubsub.pubnub.com' at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at PubNubMessaging.Core.PubnubWebRequestBase.EndGetResponse(IAsyncResult asyncResult) at PubNubMessaging.Core.PubnubWin.UrlProcessResponseCallback[T](IAsyncResult asynchronousResult) PubnubWebRequest=PubNubMessaging.Core.PubnubWebRequest PubnubWebResponse= Channel=4766110553604932_2c452c78 ChannelGroup= Description=Undocumented error. Please contact PubNub support with full error object details for further investigation ErrorDateTimeGMT=10/21/2016 11:45:35 AM 2016-10-21 07:45:36 $$ [Information] $$ Info $$ Subscribed successfully 2016-10-21 07:45:36 $$ [Information] $$ Info $$ Thread 2016-10-21 07:45:36 $$ [Information] $$ Info $$ Incoming SMS Error received,StatusCode=109 Severity=Warn MessageSource=Client IsDotNetException=False Message=Detected internet connection problem. Retrying connection attempt 1 of 50 DetailedDotNetException= PubnubWebRequest= PubnubWebResponse= Channel=4766110553604932_2c452c78 ChannelGroup= Description=No network/internet connection. Please check network/internet connection ErrorDateTimeGMT=10/21/2016 11:45:36 AM