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GE Fanuc 90-30 and 90-70 Connectivity Issue on Newer OS

There is undocumented usage of dynamic ports by GE 90-30 and 90-70 controllers in a range that is no longer open by default in newer OS such as Server 2008.
This causes issues for older PLCs 90-30 and 90-70 Series GE controllers. The solution is to edit the range of ports with the following steps:
  1. Open a Command prompt.
  2. Type netsh int ipv4 show dynamicport tcp and press Enter.
  3. You should see the currently-configured port range. Write or copy this information for future reference.
  4. Type netsh int ipv4 set dynamicport tcp start=10000 num=16384 and press Enter.
    • This command sets 16384 dynamic ports starting at port number 10000. This will provide the same number of dynamic ports (as the original OS setting) with a lower starting port address of 10000.
  5. Restart the computer.
  6. After the computer restarts open the Command window and type netsh int ipv4 show dynamicport tcp to verify the new port range.
  7. Now test with TOP Server and your client application. You should now be able to get data from the PLCs, assuming all of the settings and all other variables are correct.