Why Does a Blank Screen Appear While the System Displays a Message Indicating Successful Authentication After I Attempted to Log In to an ECS Using VNC?

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Another user has logged in to this ECS using VNC.


Only one user can log in to an ECS using VNC at a time. If multiple users attempt to log in to an ECS at the same time, only the first user can log in to it successfully. For other users, the system displays a message indicating that the user is authenticated, but the screen turns blank. If this occurs, wait until the other user logs out of the ECS.



Other related questions:
The system displays a message indicating that a license is required after I log in to the TE30
You do not have a license. For details about how to apply to the license of the TE endpoint, see Using the License.

L2TP dialup is successful after several attempts, but the system displays error 691.
After the AR is configured with L2TP, users need to dial up multiple times. During dialup, the system displays error 691. This is because the AR supports challenge messages with only 16 bytes. When the length of challenge message is not 16, CHAP authentication fails. The system displays error 691 (incorrect user name or password). To solve the problem, configure L2TP re-negotiation so that the LNS and client negotiate 16-byte challenge messages.

L2TP dialup is successful after dozens of attempts and error 691 is displayed. Why
After L2TP is configured on the device, users can dial up successfully after several attempts and error 691 is displayed during the attempts. The cause is that the device supports only 16-byte challenge messages. When challenge messages are not of 16 bytes, CHAP authentication fails and error 691 indicating user name or password error is displayed. Configure L2TP re-negotiation so that the LNS and client can negotiate the 16-byte challenge messages.

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