An unexpected error occurred on a send..

Hi Can you please refer below link?

 

https://stackoverflow.com/questions/32788409/c-sharp-httpwebrequest-the-underlying-connection-was-closed-an-unexpected-error 

Please have look at below article.

 

https://social.msdn.microsoft.com/Forums/en-US/adfb93e8-f76a-43a1-bc7b-158ad4fbe3ec/webrequest-the-underlying-connection-was-closed-an-unexpected-error-occurred-on-a-send?forum=vbgeneral