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  3. Fix connection error between waitstaff’s mobile phone and cashier’s device upon offline connection

Fix connection error between waitstaff’s mobile phone and cashier’s device upon offline connection

The restaurant applies offline connection for all devices using CUKCUK software, when opening the apps and clicking Connect, connection error message appears.

Here are the possible causes:

Please check the causes carefully and follow these steps:
1. Because the Offline Server is inactive.
In this case, you only need to activate service on CUKCUK.VN Server. Here are details:

  • Click the icon MISA CUKCUK.VN Server Manager on the bottom right of the window.
  • Enter account information, password of Manager, Chain Manager, System Admin to log in.
  • On General settings tab, click Activate server. The program will display Active status.

2. Because the staff enters wrong IP of the cashier’s device.
You should check IP of the cashier’s device as follows:

  • On Settings/General settings, on Offline working IP address of the cashier’s device is displayed, you only need to re-enter this IP address upon offline connection with the cashier’s device.
3. Because the mobile device of the waitstaff is not connected to the same network as the cashier’s device.
You need to re-select network for mobile device of the waitstaff.

For instruction on how to turn on/off 3G/Wifi see here.
4. SQL CUKCUK.VN on the device is turned off.

  • Click Start, enter Run on the search box and open Run

  • Enter services.msc on Run window

  • Search SQL CUKCUK.VN.

  • Double-click Services SQL CUKCUK.VN and click Start\OK

5.Because the cashier’s device is blocked by Firewall.
For the access which is blocked by firewall, there will be clear notification and keyword is “firewall”. Turn off Firewall as follows:

  • Click Start\Control Panel\System and Security\Windows Firewall.

  • Select Turn Windows Firewall on or off.

  • Change all status to Turn off Windows Firewall (not recommended).
  • After turning off firewall, if you still cannot get access to Internet, you should turn on firewall to secure your PC.

6. The same IP because the restaurant uses dynamic IP
To troubleshoot it, assign a fixed IP address to a MAC address for the cashier’s device/printer. Here are the steps:

Step 1: Check MAC address of the cashier’s device/printer.

Cashier’s device

  • Right-click the network icon on the bottom right of the screen. Nhấn chuột phải vào biểu tượng mạng tại góc phải phía dưới phải màn hình.
  • Click Open Network and Sharing Center.
  • Click Local Area Connection.

  • Click Details.
  • Physical Address is MAC address of the cashier’s device.

Printer: Check MAC address at product information on the printer.

Step 2: Assign a fixed IP address according to MAC address.

  • Open web browser and enter IP of Router. Commonly it is and
  • Enter Username, Password. Default Username as admin, Password is admin or 1234 or 1111.
  • Click Log in.
  • Click IP & MAC Binding, select Binding Settings.
  • Click Add New.
  • Enter MAC Address of the cashier’s device/printer.
  • Enter IP Address for the cashier’s device/printer.
  • Click Save.
7. Because User Accounts Control is not turned off on the cashier’s device.
To turn off UAC on the cashier’s device, follow these steps:

  • Click Start, enter UAC in the box Search programs and files.
  • Select Change User Account Control settings.
  • On User Account Control Settings screen, scroll down to Never Notify.
  • Click OK.
Updated on 14/09/2022

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