java.net.SocketException: Unexpected end of file from server

Kindly look once and let me know if any one been to this error.
we are calling Wm flow service s present in secured environment by https post. There wile calling we are getting below error message
[COLOR=navy][COLOR=navy][FONT=Arial]java.net.SocketException: Unexpected end of file from server
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:763)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:626)
at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:760)
at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:626)
at sun.net.[URL=“http://www.protocol.http.httpurlconnection.getinputstream%28httpurlconnection.java:983/”]www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:983)
[/color]

[SIZE=2][/URL][/COLOR][/size][/FONT]

Please elaborate more details on your flow steps and how are sending…So users can assist you in a better way:

HTH,
RMg