To print labels from a SmartScan device by using QZ Tray, you must install the QZ Tray root CA certificate on the SmartScan device. Installing the certificate allows SmartScan to trust the QZ Tray print server and communicate with it securely.

This article also outlines steps for installing the certificate on a Windows PC.

Before you begin

Make sure that:  

• QZ Tray is installed and running on the machine to be used as a print server. If you don’t have it installed yet, download QZ Tray from their website and follow their installation instructions. 
• The printer is configured on the computer to be used as a print server. If you are using Zebra printer, see our article on Configuring Zebra Printer. 
• The SmartScan device can reach the QZ Tray server on the same network.
• You know the IP address and port of the QZ Tray server (QZ Tray defaults to 8181 and 8182).

Step 1: Open the QZ Tray server page

1. On the SmartScan device, open the web browser.
2. In the address bar, enter the QZ Tray server URL using the server’s IP address and port.

Example: https://10.0.0.8:8181

3. Use the IP address and port of your QZ Tray host.
4. Wait for the QZ Tray page to load.

Step 2: Download the root-ca certificate

1. Scroll to the Certificates section on the QZ Tray server page
2. Locate the alias root-ca.
3. Click Download certificate.
   

Step 3: Install the certificate on your SmartScan device. 

1. On the SmartScan device, go to: Settings > Security > Encryption and Credentials.
2. Select Install a certificate.
3. Select CA certificate.
4. Browse to and select the downloaded root-ca certificate file.
5. Accept any prompts to complete the installation.

Installing the certificate on a Windows PC 

Other computers on the network that need to print through the QZ Tray server such as workstations running SmartScan, Small Parcel Suite or Process Packages from the WMS must also trust the QZ Tray root CA certificate. The steps below show how to install it on Windows 11. The exact steps may vary depending on your OS type and version.

1. Copy root-ca.crt from the QZ Tray print server to the Windows PC.
2. Double-click root-ca.crt to open the Certificate dialog.
3. Click Install Certificate.
4. For Store Location, select Local Machine (administrator access required), and then click Next.
5. Select Place all certificates in the following store, click Browse, select Trusted Root Certification Authorities, and then click OK > Next > Finish.
6. Confirm the security warning by clicking Yes.
   
   Alternatively, you can import the certificate using the Microsoft Management Console: run certlm.msc, navigate to Trusted Root Certification Authorities > Certificates, right-click, and select Import.
    

Step 4: Print a test label from a SmartScan.

1. Click the hamburger menu in the upper-right corner, and then select Settings. 
   
   
2. Select Print. 
   
3. Click Print a Test Label.
   

   The Printer drop-down menu in SmartScan displays all printers available, not just ZPL printers. Only a ZPL printer should be selected or printing will not work.

    

4. Confirm that the label prints successfully through QZ Tray.