Payment terminals operate most reliably when Wi-Fi networks allow secure WebSocket communication. If a network happens to block this type of connection, the terminal may stop working as expected. Ensuring WebSocket access typically resolves the issue quickly.
This guide explains the most common causes and how to resolve them in simple steps.
Quick first step
If your business has more than one Wi-Fi network, try connecting your payment device to the other network. When one works and the other doesn’t, it’s an indication that the issue is with your network settings—not the payment terminal.
How to fix the problem
These steps must be done by someone with access to the router or network settings (your IT person or network administrator). Your IT or network administrator must make these changes—our team can't adjust a customer’s router on their behalf.
Check the following on the problem network:
Restart the modem and router
(Unplug for 10 seconds, then plug back in.)
Turn off parental controls or extra security features
These features can block payment traffic. Look for settings such as:Safe Browsing
Advanced firewall settings
High-security modes
Content filtering
Turn off IPv6
Payment systems work best on IPv4. IPv6 can interfere with connections.
Disable any special filtering or traffic-control features
Some routers include features that block or inspect certain types of traffic, which can block payment communication.
Important recommendation: Avoid Wi-Fi for busy gyms or high-traffic locations
For high-volume businesses, we strongly recommend using a wired (LAN) connection. A hardwired cable is more stable than Wi-Fi, especially in busy environments where many personal devices connect to the network.
When Wi-Fi must be used, follow the best practices below.
Best Wi-Fi setup for payment devices
1. Use a separate Wi-Fi network just for payment devices
Create a dedicated Wi-Fi network (SSID) only for:
Payment terminals
POS system
Other critical devices
This prevents personal devices from slowing down your network or causing connection drops.
2. Use the 5 GHz band only
Payment devices work best on 5 GHz, which has far less interference than 2.4 GHz.
3. Use reliable business-grade access points
In larger spaces, you should have at least two access points so devices can stay connected without drops.
Well-performing brands include:
Ubiquiti UniFi
TP-Link Omada
Ruckus (enterprise-grade)
Avoid home mesh systems (Google Nest, Eero, Orbi), as they aren't designed for commercial environments.
4. Have a backup connection
Even strong Wi-Fi can fail. Many payment terminals support cellular (4G/5G) backup, which keeps transactions running even when Wi-Fi goes down.
Need help?
If your payment terminal works on one Wi-Fi network but not another, the issue is almost always caused by the network settings. Your network administrator can adjust the router settings using the steps above. If you need further assistance, please contact WellnessLiving Support.