fwrite() error

Notice: fwrite() [function.fwrite]: send of 11 bytes failed with errno=1 Operation not permitted in /home/a2492707/public_html/samp_query.php on line 82

   
 function SendPacket( $cPacket )
    {
            $szPacket = 'SAMP';
            $aIpChunks = explode( '.', $this->szServerIP );

            foreach( $aIpChunks as $szChunk ) {
                    $szPacket .= chr( $szChunk );
            }

            $szPacket .= chr( $this->iPort & 0xFF );
            $szPacket .= chr( $this->iPort >> 8 & 0xFF );
            $szPacket .= $cPacket;

            return fwrite( $this->rSocketID, $szPacket, strlen( $szPacket ) );
    }

return fwrite( $this->rSocketID, $szPacket, strlen( $szPacket ) );