No Host connection or not obtaining an IP address can occur for many reasons. Some common causes of the issue are:

The printer is not physically connected to the network.
An ethernet cable or network device is defective.
The network is having trouble communicating with the printer due to configuration issues.

The troubleshooting steps below apply to the following printer models:

Printer model	Network Issue Behavior
Star Micronics TSP100	Ready light blinks and prints a receipt with the words “No Host Connection.”
Star Micronics SP700	The ready light and error light blink simultaneously.
Epson TM-T20-ii	Prints a receipt with an IP address of 192.168.192.168 and DHCP shows No Server.
Epson TM-U220B	Prints a receipt with an IP address of 192.168.192.168 and DHCP shows No Server.
Epson TM-L90	Hold down button on the back of the printer next to the ethernet port for 3 seconds.
Epson TM-T88V-i	Prints a receipt with the word “DHCP client start. Please wait until IP address is printed.”

Recommended Troubleshooting steps:

Power the printer off/on to refresh the printer’s network info.
Ensure all network devices such as modems, router and switches are powered on.
Check the ethernet cable between the printer and network router for any damage or loose connection.
If possible, try swapping the Ethernet cable with a known-good cable or temporarily install the printer where another printer is already working properly.
If the issue affects multiple printers or the printer is detected by talech and will not test-print in the register application, consult with an IT professional to ensure the network is configured properly

Troubleshooting - Printers - No Host Connection or Did Not Obtain Error