ConnectCNC 2.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This tool was originally created by CNC Consulting. The program belongs to Internet & Network Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
DNC or file transfer between computer and CNC Control. We offer ConnectCNC as an alternative to the very powerful, but very expensive DNC programs designed to service many machines at a time. You can use ConnectCNC for any number of machines, and simultaneous transfer or DNC capability is limimited only by the number of COM ports on your PC. Note that each of the CNC controls in your shop can have its unique configuration and port designation.
You may want to check out more software, such as COMODO Firewall Pro, SecureCRT or NetCafe, which might be similar to ConnectCNC.