TCP error 1001 - VeriFone Vx 570 Dual Comm Credit Card Terminal

This indicates an ip connection error.
Unplug the terminal. Wait 5 seconds. Plug back in.
After it reboots you will see two or more menu options. Select CommServer (instead of Credit/Debit) by pressing the function key beside it.
Select Troubleshoot to allow it run through the diagnostics. Push the purple button below "Print" to print the results.
Now select Repair by pushing the function key next to it. After the repair routine has run, press * on the keypad to return to the main menu.
Select Credit/Debit and then try swiping a card and performing a transaction. This hopefully will solve the problem for you. If not, call your merchant services provider's tech support and share the error message and tell them you printed the troubleshooting diagnostics report and they should be able to assist further.