Desktop
TOS (TerraMaster Operating System) is a web-based operating system specifically designed for TNAS devices. Through the TOS operating system, you can quickly and easily complete tasks such as modifying system settings, installing and opening applications, and managing storage space.
Login and Logout
Login
After your TNAS device has installed the TOS system and completed initialization, you can log in to the TOS system using the TNAS PC application. Alternatively, you can check the IP address of your TNAS device through the TNAS PC application and enter that address in a browser to log in to the TOS system.
- Forgot/Reset Password: If you forget your password, the system will send a verification code to your email to verify your identity. Once verified, you can reset your password.
- Stay Logged In: Enabling the stay logged in feature will save your login information in the browser for quick access to the TOS system next time. However, please be cautious when logging in on public devices to ensure account security.
- During the initialization process, you have set the IP address, administrator name, and password for the TOS system. If you cannot log in to the TOS system, please go to http://tnas.local or use the TNAS PC application to select the corresponding device and reset it.
- Clearing the browser cache or cookies may cause you to lose your current login status. It is recommended to log in again after clearing to ensure account security and normal use.
OTP Two-Factor Verification
OTP provides an additional level of protection for your account through an extra step of authentication and dynamic password mechanism. Please go to TOS Desktop > Start > User Settings to enable the OTP (One-Time Password) two-step verification feature.
- Enable OTP: Please download and install the TNAS Mobile App on your mobile device. Open the OTP verification application in the app and follow the instructions in the OTP setup guide in the system to enable the OTP two-step verification feature.
- Manage Trusted Devices: Select “Add this terminal as a trusted device” to view and manage your login devices in the trusted devices list. When logging in from a trusted device, TNAS will not prompt you for OTP two-step verification.
- Disable OTP: Click the disable button and enter your user password to turn off the OTP two-step verification feature.
- Please ensure your mobile device and TOS system time are synchronized to avoid verification issues due to time differences.
- OTP codes refresh every 60 seconds. Make sure the entered code has not expired.
- If you log in with the same account on different browsers, clear browser cookies, or log in to other OTP-protected accounts on the same browser, even if you previously marked a device as trusted, you will still need to perform OTP two-step verification in these situations.
Logout
To manually log out, go to TOS Desktop > Start, click the logout, restart, or shutdown button in the upper right corner, and select “Logout” based on your needs. Administrator users can enable the system auto-logout feature, which will automatically log out the current user after the set timeout period.
TOS Desktop
After successfully logging in, you will enter the TOS desktop, which includes the top navigation bar, main menu, and right-hand toolbar.
Navigation Bar
The top navigation bar integrates multiple fixed function entries such as the start menu, file management, all applications, backup, control panel, application center, Docker Manager, and support & help. It also supports pinning frequently used applications to the navigation bar for quick access and use.
Main Menu
You can create URL shortcuts and edit user settings in the main menu, quickly launch or uninstall installed applications.
- Create URL Shortcut: Please enter a complete and valid web access path (e.g.,
http://192.168.1.1:5443). - Edit User Settings: Modify user account information and customize system appearance (e.g., set the system appearance to dark mode).

For security reasons, changing your password will interrupt all ongoing tasks and require re-login. Please proceed with caution.
Toolbar
The toolbar helps you quickly use some common features of TOS such as the system dashboard, notifications, buzzer switch, and help & support.
- System Dashboard: The system dashboard is a floating menu for quickly displaying key information of the TOS system and TNAS device, such as device name, TOS version, uptime, network connection status, and storage space. You can drag to adjust the sorting of these information components. To customize the displayed menu content, click the “Settings” button in the upper right corner of the menu.
- Notifications: Receive notifications about system security, application installations, status updates, power, etc. To set the types of messages you want to receive, click the “Settings” button in the upper right corner of the menu.
- Buzzer Control: When TNAS encounters an issue, the buzzer will sound an alarm. You can turn off the buzzer by clicking the bell icon.
- Help: If you need help or support, click “Help” to contact us.
- Background Tasks: When there are tasks running in the background, click this icon to see more detailed information, such as progress and upload speed.