# Error Displayed on Web Viewer Client Application

The following messages may appear on the client application. Listed are descriptions and potential solutions to resolve any errors.

Error | Cause | Solution
[Invalid user name or password. Enter the correct user name and password.] | In the login page, an incorrect user name or password has been entered. | Login with a valid user name and password.
[Failed to connect to the server. On the server, confirm Web Viewer is enabled and check the security software configuration. To try connecting again, return to the initial screen by clicking the [Refresh] button on your browser.] | Connection to the server could not be established. | Check why a TCP connection could not be established. In the screen editing software, confirm the Web Viewer setting is enabled. Confirm security software is not preventing a TCP connection. Also confirm the port configured in the Web Viewer setting matches the port used by the client. Configuring the Server
[Reached maximum number of client connections. Please try logging in later.] | The server rejected the connection request as the server has reached the maximum number of client connections (*) it can support. * Maximum number of client connections is: 3 for ST6000 Series and STM6000 Series 5 for other models | Try to log in later.
[The login user is locked out. The user will be unlocked after ** seconds.] | In the client login page, the specified user has been locked out. | Wait the specified [Lockout Time] before trying to log in.
[Logout occurred because security settings are being updated. Click the [Refresh] button on your browser to return to the login screen, and then log in again with the updated user name and password.] | The user has been logged out as the security settings (user names and passwords) on the server were updated. | Log in with a new user name and password.
[Login failed because the password has expired. To change the password on the display unit, use the [Change Password] function. To change the password in the screen editing software, change the password in the [Security Settings] and transfer the project file again. ] | The specified user is set up with an expiration period for its passwords, and the expiration period has elapsed. | Use one of the following to resolve this issue. Configure a new password on the display unit. In the screen editing software, set a new password in the [Security Settings] and transfer the project to the display unit. Try to log in from the client again.
[Operation did not complete within the specified time. Connection terminated.] | Client has not performed any operations for the time specified in the [Inactive Timeout] property. | Log in from the client again or increase the time in the [Inactive Timeout] property.
[Communication terminated because project has been transferred. Please return to the initial screen by clicking the [Refresh] button on your browser.] | The client was unable to reconnect to the server and communication was terminated. | The project on the server was updated. To establish a new connection to the server, click the [Refresh] button on the browser.
[Unsupported gesture was detected. Please touch this message window and continue operation.] | This message notifies the user that a gesture, such as three-point touch, supported by the device but not supported by Web Viewer was detected. | Touch anywhere on the screen to close the message.
[Internal Server Error.] | There is a problem with the server configuration. | Update the run time on the server and try connecting again.
[Server Temporarily Unavailable. Please try connecting again later with the browser's [Refresh] button.] | Server is busy or a communication error occurred. | Try connecting again. If the message continues to appear, check your network connection. You could also try connecting from another client.
[Authentication failed. After waiting awhile, click the [Refresh] button on your browser to return to the login screen and try logging in again.] | Session has expired. | To establish a new connection to the server, click the [Refresh] button on the browser.