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Logging in and out

Tap the launcher icon to start T.Flex. Type your username and password for the TASSTA network and press the CONNECT button to log in to the TASSTA server.

To make T.Flex log in automatically, specify the User name and Password options and enable the Autologin option in the application settings.

If you want to change your password, use the Reset password item in the main menu.

Connection security details

All TASSTA applications use an encrypted connection that enables authentication, session management, and access control mechanisms. All data between clients and servers is exchanged through encrypted channels. This protects the connection from active eavesdropping and passive disclosure in the network traffic. It also prevents session fixation attacks during the authentication or authorization processes.

In order to manage access to enterprise networks, the TASSTA administrator has the ability to assign rights and permissions to any TASSTA user in T.Commander. Any TASSTA client must be configured with proper connection settings before attempting to log in.

All important connection settings in T.Flex are contained in the Settings menu. For details about configuring them, see Application settings.


The T.Flex client application uses the HTTPS protocol for communication with the server. This makes data exchange robust and secure.

Voice encryption

By default, all TASSTA communication traffic is encrypted with TLS using 256-bit AES-SHA. The client and the server authenticate using digital certificates. The standard TASSTA server does not support voice encryption. However, the encryption option can be used on demand. If the specific encryption algorithm is not defined, TASSTA will offer an Authenticated-Encryption Algorithm with blockcipher: AES128, AES192, and AES256 specified in ISO/IEC 19772:2009.

Secure logout

To improve safety, T.Flex provides an additional authentication mechanism on logout. This is controlled through T.Commander and can be enabled by the TASSTA network administrator. The feature forces the user to enter a specific password for logout.

QR code-based authentication

QR code-based authentication can be useful in some operating conditions and has the additional advantage of applying preconfigured T.Flex settings.

  1. Tap the QR code icon on the login screen of the application. You will be prompted to scan a code with your camera in a few moments.
  2. Focus the camera and scan the code. The new T.Flex settings are applied automatically.
  3. Tap the CONNECT button to authenticate.