Sharepoint 2010: An existing connection was forcibly closed by the remote host when log in using form based authentication

I'm receiving this error after i login on my site using form based authentication

"An existing connection was forcibly closed by the remote host"

when i check the log here's what it says:

"An exception occurred when trying to issue security token: An error occurred while receiving the HTTP response to http://localhost:32843/SecurityTokenServiceApplication/securitytoken.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details"

can some one help me on this? thank you very much.