Square Register Troubleshooting
There are basic checks you can do for issues you may encounter with Square Register. Make sure to walk through the following before going through issue-specific troubleshooting steps:
Make sure your device is connected to power. Square Register needs to be powered to function.
Make sure your device has the latest software. Software updates typically take around 20 minutes to complete, but may take up to one hour. Square Register will update automatically overnight as long as it is powered on and plugged in.
To update your Square Register software:
Tap the down arrow at the top of your Square Register.
Tap Hardware > General > About Register.
Tap Software Update. If there is no update, your software is up to date.
Make sure your device’s date and time are accurate. If they are incorrect, update them via the Settings > General section.
Make sure your Square account is activated.
Customer display doesn’t recognize tap or contactless payment.
On Square Register, confirm that you’ve pressed the Charge button to activate the customer display to accept contactless cards and phones. The LED indicators should light up when you tap the Charge button.
If the contactless card or NFC-enabled phone is damaged or broken, ask your customer to use a different form of payment.
Chip cards aren’t recognized.
Ensure chip cards are inserted with the chip facing towards the buyer when the customer display is both docked and undocked.
If magstripe and contactless payments still work, the chip may be damaged. In this case, ask your customer to present a different form of payment.
If magstripe cards and contactless payments still work, something may have damaged the chip card slot. If you think this is the case, contact Square Support.
Payments aren’t going through.
Check your Wi-Fi and Ethernet connection by following the troubleshooting steps below.
Is the customer display connected to Register properly?
If your device is docked:
Make sure that the display is docked completely and evenly on both sides. There should not be any gap between Register and the customer display and you should hear the latch click on both the left and right sides of the customer display.
See if undocking and connecting the customer display via USB cable works. This can help Square diagnose whether it is an issue with the docked position only.
If undocked and connecting via USB cable:
Make sure that the USB cable is plugged in properly into both the customer display and the bottom of the Register.
See if docking the customer display works. This can help us diagnose whether it is an issue with the undocked position only (It is possible that there is an issue with the cable that connects to two devices).
Most display issues, such as a few common ones listed below, are resolved by undocking/docking or unplugging/plugging in the customer display. You can also reboot the system by using the power on the bottom edge of Square Register.
Customer display not responding to touch.
Customer display frozen on one screen.
Customer display stuck on the Square logo.
If you’re still having trouble after you’ve tried these troubleshooting steps, please contact our Support Team.
Hub Connectivity Troubleshooting
Test another accessory
To determine whether there is an issue with the Hub or with the USB hardware accessory (printer, barcode scanner, cash drawer), try connecting a different USB hardware accessory to the Hub.
Test USB ports
Try plugging the USB hardware accessory into a different port. The issue may be isolated to one port.
Confirm Square Register is connected to Wi-Fi
Toggle Wi-Fi off and on in Settings > Hardware > Network and check to make sure that you see a checkmark next to the network to which you are trying to connect. Confirm that you see the Wi-Fi status indicator on the top right corner of the status bar.
Keep in mind, you won’t be able to connect your Square Register to a captive portal network. A captive portal is a network that requires you to agree to terms or conditions to access the internet connection (these networks are common at coffee shops, airports, and other public internet access points).
Confirm Wi-Fi signal strength
Confirm that you have a strong Wi-Fi signal by checking other devices (such as phones, tablets or laptops) on your network near the location of your Square Register. The Wi-Fi status indicator in the upper right corner of the status bar should have 3-4 white bars to indicate a strong signal. Depending on the position of your router, you may need to move your Square Register closer to your router. If it does not, consider contacting your network professional.
Switch to Ethernet
If you have an Ethernet connection available, switch to Ethernet by plugging in a cable to the port on the Hub.
Confirm Square Register is connected to Ethernet
Confirm that you can see the Ethernet network status indicator in the top right corner of the status bar. If you don’t see the Ethernet network status indicator, try unplugging and plugging in the cable from the Ethernet port on the Hub and from the router or modem.
Confirm modem/router connectivity
Test your modem and/or router by plugging in other devices (such as a laptop) and seeing if they connect to the internet.
Switch to Wi-Fi
If you have a Wi-Fi network available, unplug the Ethernet cable and switch to Wi-Fi in Settings. Make sure to unplug the Ethernet cable since the device will default to using Ethernet connection over Wi-Fi if both are available.
Offline Mode Troubleshooting
If Offline Mode is enabled in your settings, Square Register will automatically activate Offline Mode if your internet connection is disrupted or lost. If your device goes into Offline Mode without losing a network connection, try the following troubleshooting steps:
Forget the network you are connected to on your device.
Reconnect to the same network.
Reboot the system by pressing the power button on the bottom edge of Square Register.
Note: Do not factory reset your Square Register. Doing so will delete any Offline payments you have not uploaded.
Learn more about accepting payments in Offline Mode.
Reset your Register
On rare occasions, you may need to perform a factory reset. Don’t worry: resetting your device will not erase important account settings like items, transaction histories, customer lists, or team permissions. It will all be there when you sign back in.
Before resetting your Register, please have the following information on hand since you’ll need it to log back in afterwards:
Wi-Fi network name and password.
Account login information (email and password) or device code.
Location name, if applicable.
Accessory settings: printer stations, drawers, and any other accessories. Recommendation is to take a picture of the configuration of each accessory.
To reset your Square Register:
If you have taken any offline transactions, be sure to reconnect to the internet and process them before proceeding. Pending offline payments will be permanently lost and the funds won’t be captured when you reset your device.
Tap the down arrow on your Register and tap Settings.
Tap Hardware > General > About Register.
Scroll to the bottom of the screen and tap Factory Reset > Confirm Factory Reset.
Tap Reset one last time. The countdown will begin and your Register will reset.
Once the reset is complete, you’ll need to reconnect to your internet connection and sign back in.
Go back through basic setup questions like your time zone, date, and time.
Reconnect to the internet and sign back in with your email and password or device code.
Add accessories such as cash drawers, printers, barcode scanners, or scales. Learn more about connecting compatible hardware to Square Register.
Adjust any settings back to your preferences.
If you enforce restrictions on what protocols and ports that devices on your network can access, Square devices require the following protocols and their corresponding ports to be allowed through your firewall:
NTP. Note: This is critical for ensuring that the device has the correct time. Connectivity may fail due to certificate validity mismatches if the device time is wrong.
HTTPS (only port 443). Note: All traffic to Square servers is made over HTTPS.
The following ports are also used for network printers, but these do not require access to the internet:
UDP: 22222, 3289
If you enforce restrictions on what domains can be accessed from within your network, Square devices require the following domains to be whitelisted.
All subdomains of:
As well as the following FQDNs:
NTP requires access to:
Square’s IP address ranges are:
Note: Square devices have an internal firewall and an internal (domain, not IP) whitelist, and perform TLS certificate pinning on all Square endpoints, so you may consider the IP whitelisting on your side redundant depending on your purpose. It could make sense to just ensure Square devices can’t access any internal company IP addresses, and leave the rest of the internet open for Square’s on-device firewall and domain filter.
Square’s MAC OUI: 2C:D1:41
Merchants should whitelist all MAC addresses that start with the above prefix (ie. devices with MAC addresses following the pattern 2C:D1:41:XX:XX:XX). Alternatively, merchants can whitelist each individual device that shows up with that MAC address prefix (this prefix is owned by Square and should not be used by any other device vendors).
Square devices are compatible with any DNS server sent to the device over DHCP as long as it works. Feel free to use your ISP’s servers, or your favorite public servers (e.g. Level3 at 126.96.36.199/188.8.131.52).
Supported Network Authentication Protocols
Square devices support:
WEP (US only)
They do not support:
WPA3 PSK/WPA3 Enterprise
Cleaning your Register
For minor scuffs and marks, you can use any electronic cleaning cloth included with your Square Register.
To clean the reader on Square Register, you can use card reader cleaning cards or a folded paper towel. Slide the cleaning card or paper towel through the card reader slot to clear any spills or debris.
If you are still having trouble, please contact Square Support and we can help get you back to business.