The remote host forces an existing connection to be closed. How can this problem be solved?

The remote host forces an existing connection to be closed.

Note:An error occurred while executing the current Web request. Check the stack trace information to learn about this error andCodeDetailed information about the cause of the error.

Exception details:System. net. sockets. socketexception: the remote host forces an existing connection to be closed.

Source error:

Row 144 :{ Line 145: httpwebrequest webrequest = (httpwebrequest) webrequest. Create (URL ); Line 146: httpwebresponse webresponse = (httpwebresponse) webrequest. getresponse (); Row 147: stream = webresponse. getresponsestream (); Line 148: streamreader reader = new streamreader (stream, system. Text. encoding. getencoding ("gb2312 "));