An existing connection was forcibly closed by the remote host

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ASP.NET

using the password recovery control
i have this code in the web config

<system.net>
    <mailSettings>
      <smtp from="user@yahoo.com">
        <network host="smtp.mail.yahoo.com" password="password" port="465"
          userName="user@yahoo.com" />
        
      </smtp>
     
    </mailSettings>
  </system.net>

with this error.......
An existing connection was forcibly closed by the remote host

please what shall i do?????
thanks