Check the back or bottom of the printer for a label containing the serial number Some units have a specific "Password" label with an 8-digit number; use this if available. How to Access the Web Config Utility
The default administrator password for the Epson TM-T20III Go to product viewer dialog for this item. epson tm-t20iii default admin password
While "admin" is the standard for the TM-T20III Web Config, older Epson legacy protocols or specific firmware versions occasionally utilized other defaults. Check the back or bottom of the printer
The TM-T20iii is primarily a USB or Ethernet printer. It does not have a "router-style" admin panel on the printer itself. The password is used for: epson tm-t20iii default admin password