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FusionAccess V100R006C20 Cloud Classroom Solution Product Documentation 10 (Single-Classroom Scenarios)

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
VNC Login Troubleshooting

VNC Login Troubleshooting

Java Plug-in Faults

After the Java (TM) plug-in is installed, perform the following operations to ensure that it has been enabled for the maintenance terminal.

Procedure

  • In the Java installation directory (for example, C:\Program Files\Java\jre7\bin), double-click javacpl.exe to open the Java Control Panel window.
  • On the Java tab, click View to check whether the Java (TM) plug-in of the 1.7.0_65 version has been enabled. If multiple versions are installed, reserve only the 1.7.0_65 version.

Fault 1: The system displays "This function requires the Java (TM) plug-in. Please download and install the Java plug-in."

Solution: Download the corresponding version of the Java plug-in as instructed.

Fault 2: The system displays "The version of the Java (TM) plug-in you have installed is earlier than 1.7.0_65. Please download and install a later version to support this function."

Solution: Download the corresponding version of the Java plug-in as instructed. If the Virtual Network Computing (VNC) login fails again after the Java plug-in is installed, uninstall all the Java plug-ins and reinstall them.

Fault 3: A message is displayed indicating that the Java (TM) plug-in expired or is not safe.

Solution:

  • Click Run and log in to a VM using VNC. The information will be displayed again upon next login.
  • Download and install the Java plug-in of the latest version.

Fault 4: The system displays "Your Java version is insecure."

Solution:

  • (Recommended) Do not update the Java plug-in.

    Click Later and select Do not ask again until the next update is available.

  • Update the Java plug-in.

    Click Update and download and install the latest Java plug-in as prompted. After the installation, restart the browser and log in the system using VNC.

    If Update is clicked, VNC is available only after the new Java plug-in is installed.

Mozilla Firefox Setting

If you import local files using a Mozilla Firefox browser, the import operation may fail because the applet plugin of the browser will periodically clear caches. Therefore, set a proper cache clearance period for the browser.

  1. In Mozilla Firefox address bar, enter about:config and press Enter.
  2. Click I'll be careful, I promise!.
  3. Search for "dom.ipc.plugins.unloadTimeoutSecs".
  4. Double-click dom.ipc.plugins.unloadTimeoutSecs and change the default value to 300.
    NOTE:

    After this configuration, the plug-in will not break down within 300s. If you stay on VM configuration pages for longer than 300s, the breakdown may still occur.

  5. Restart the browser.

Login Faults

Fault 1: After Log In Using VNC is clicked, a dialog box is blocked.

Solution:

  • Disable the pop-up blocker of the browser.
  • Configure the pop-up blocker settings to always see pop-ups for the site.

Fault 2: If "The web site certificate cannot be validated. Do you want to continue?" is displayed, the VM login using VNC fails after No is clicked.

Solution:

  1. Deregister the current user.
  2. Close all the pages of the browser.
  3. Log in to the FusionCompute again.
  4. Click Log In Using VNC.
  5. Click Always trust the issuer's content.
  6. Click Yes.

Fault 3: The system displays "The VM attached with a graphics cardGPU cannot be logged in to using VNC after the graphics cardGPU works. Detach the graphics cardGPU from the VM and try again or log in to the VM by running mstsc."

Solution:

  • Detach the graphics cardGPU from the VM, close the VNC login page, and log in to the VM using VNC again.
  • Log in the VM in remote mode.

Fault 4: The VNC login is unavailable after the FusionCompute is upgraded or rolled back after upgrade.

Solution:

  1. In the Java installation directory (for example, C:\Program Files\Java\jre7\bin), double-click javacpl.exe to open the Java Control Panel window.
  2. Click Settings to open the Temporary Files Settings window.
  3. Deselect Keep temporary files on my computer.
  4. Click Delete Files, select all the files in the displayed dialog box, and click OK.

Fault 5: During the VNC login, a message is displayed indicating that the Java security settings have blocked an application from running.

Solution:

  1. In the Java installation directory (for example, C:\Program Files\Java\jre7\bin), double-click javacpl.exe to open the Java Control Panel window.
  2. Lower the security level on the Security.
NOTE:

A Java version later than Java 8 Update 20 is not configured with security level Medium. Therefore, only security levels High and Very High are available. To lower the security level, you can add the application programs that are allowed by security level Medium in earlier versions to Exception Site List one by one. Therefore, a Java version later than Java 8 Update 20 reduces the risks caused by a lower security level.

Fault 6: During VNC login, a dialog box is displayed asking you to enter the password.

Solution:

  1. In the Java installation directory (for example, C:\Program Files\Java\jre7\bin), double-click javacpl.exe to open the Java Control Panel window.
  2. Click Settings to open the Temporary Files Settings window.
  3. Deselect Keep temporary files on my computer.
  4. Click Delete Files, select all the files in the displayed dialog box, and click OK.

noVNC Login Faults

Fault 1: During login using noVNC, a page is displayed indicating that login failed.

Solution:

  1. Log in to the VRM using PuTTY, run the following command to restart the noVNC service:

    service vncd restart

  2. Clear up browser cache files, reset the browser, and use noVNC to log in to the VM again.

CD/DVD-ROM Drive or ISO File Mounting Faults

Fault 1: After logging in to a VM using VNC and mounting a CD/DVD-ROM drive or ISO file to the VM, the user cannot install the Linux operating system (OS).

Solution: Click , and restart the VM as instructed.

Fault 2: During CD/DVD-ROM drive or ISO file mounting, the CD/DVD-ROM drive or ISO file is disconnected.

Solution: Mount the CD/DVD-ROM drive or ISO file again. The following operations cause CD/DVD-ROM drive or ISO file disconnection during mounting:

  • The VNC login page is closed.
  • The VNC login page is refreshed.
  • Log in to the same VM using VNC for multiple times.

Fault 3:After a CD/DVD-ROM drive is successfully mounted, an exception occurs if you view the CD/DVD-ROM drive file.

Solution:

  1. In the Java installation directory (for example, C:\Program Files\Java\jre7\bin), double-click javacpl.exe to open the Java Control Panel window.
  2. Click Settings to open the Temporary Files Settings window.
  3. Deselect Keep temporary files on my computer.
  4. Click Delete Files, select all the files in the displayed dialog box, and click OK.
  5. Clear the browser cache, restart the browser, mount the CD/DVD-ROM drive again, and check whether the CD/DVD-ROM drive works properly.
    • If yes, no further action is required.
    • If no, go to 6.
  6. Log in to the host accommodating the VM, run the service rcdromsvc restart command to restart the CD/DVD-ROM drive, and mount the CD/DVD-ROM drive again:

    service rcdromsvc restart

Input Delay

Fault 1: When a user inputs information using a keyboard, the VNC window responds slowly.

Possible Causes:

  • The network delay is high.
  • The CPU or memory usage on the local PC is high.
  • The Java plug-in cache is high.
  • The host loads are high due to excessive VM VNC logins.

Solution: Typically, the VNC window responds to user inputs within 0.3 second. If the VNC window takes more than 0.3 second to respond, check the system based on the preceding possible causes, and troubleshoot the system.

Other Faults

Fault 1: The keyboard does not function in a VM.

Solution: Click Alt or Ctrl on the VNC toolbar to unlock the keyboard.

Fault 2: The browser does not respond if the user clicks Log In Using VNC.

Solution: If you have logged in to the VM using VNC, the login page is not displayed after you click Log In Using VNC. Therefore, check whether the login page has been opened already.

Fault 3: If multiple VNC windows are concurrently opened, the VNC windows may repeatedly pop up when users are performing other operations, adversely affecting users' operations.

Solution:

  1. In the Java installation directory (for example, C:\Program Files\Java\jre7\bin), double-click javacpl.exe to open the Java Control Panel window.
  2. Click View on the Java tab, add parameter -Xms128M -Xmx256M -Xverify:none to Runtime Parameters, click OK, and restart the browser.

Fault 4: Due to a driver error, the mouse cursor cannot be displayed in the VM that binds to certain GPUs, such as NVIDIA GRID K1 and NVIDIA GRID K2, after the GPU driver is installed on the VM.

Solution:

  • For the VNC of early versions: Log in to the VM using the VNC and click in the VNC window.
  • For the VNC of the latest version: Log in to the VM using the VNC and press Ctrl+Alt+Shift. In the configuration window that is displayed, select Display local PC mouse cursor. Then, press Ctrl+Alt+Shift again to hide the configuration window.
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Updated: 2019-04-25

Document ID: EDOC1100010651

Views: 26128

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