When you try to open a Horizon FLEX virtual machine for the first time, you receive a message that the restrictions management server could not be contacted.

Problem

When you try to open a Horizon FLEX virtual machine for the first time, the restrictions management server cannot be contacted.

Cause

This error occurs because your operating system does not trust the Horizon FLEX server's certificate. The error may also occur if the user is offline or the Horizon FLEX server is down.

Solution

  1. Verify with your Horizon FLEX administrator that the certificate is valid for the Horizon FLEX server.
    Important: Do not perform this task if the certificate is not valid.
  2. If you are using Fusion Pro, install the Horizon FLEX server's certificate on your Mac.
    1. In your browser, go to the Horizon FLEX server URL.
      For example: https://yourserver:7443
    2. Accept the certificate warning to save the certificate.
    3. Open the KeyChain application.
    4. Find the certificate under login and drag it to System.
    5. Open the certificate under System. Expand the Trust button, select Use System Default, and close the certificate.
    6. Reopen the certificate under System, expand Trust, select Always Trust, and close the certificate.
      The certificate is now trusted for all users on the Mac.
  3. If you are using Workstation Player, install the Horizon FLEX server's certificate on your Windows system.
    1. In your browser, go to the Horizon FLEX URL.
      For example: https://yourserver:7443/rvm
    2. Click the lock icon in the address bar.
    3. Click Certificate information.
    4. On the Details tab, click Copy to file and export the certificate to a file.
    5. Start MMC (mmc.exe).
    6. Select File > Add/Remove Snap-in.
    7. Click the Certificates snap-in and click Add.
    8. On the Certificates snap-in display, select Computer account and click Next.
      This setting is required by the Horizon FLEX server.
    9. Select Local Computer and click Finish and then OK.
    10. In the left navigation pane, expand Certificates (Local Computer).
    11. Right-click on Trusted Root Certification Authorities and select All Tasks > Import.
      The Certificate Import Wizard opens.
    12. Click Next.
    13. Browse for the root certificate file and click Next.
    14. Select Place all certificates in the following store: Trusted Root Certification Authorities and click Next, then click Finish.
      The certificate is now trusted for all users on your Windows computer.