As Bloomberg News put it today in a story about Alpha, some mines must die for others to live. And some companies will also die. CONSOL Energy Inc. (NYSE: CNX) is the largest coal producer by market cap, but its survival plan is based on becoming a natural gas producer.So far that has been only a partial success because natural gas prices are so low.nd some companies will also die. CONSOL Energy Inc. (NYSE: CNX) is the largest coal producer by market cap, but its survival plan is based on becoming a natural gas producer. So far that has been only a partial success because natural gas prices are so low.
From the server-side firewall's standpoint, to support passive mode FTP the following communication channels need to be opened: 1  FTP server's port 21 from anywhere (Client initiates connection)  FTP server's port 21 to ports > 1023 (Server responds to client's control port)
Also key is to search for the DNS and class Bs for open Telnet, as well as HTTP, HTTPS, SSH, etc. since some devices will not have SCADA/ICS ports open, but are systems that are gateways from TCP to Modbus, etc. These usually have a port like 80, 443 or 23 open, port 21 for FTP, and on occasion 161 (snmp).