Your system administrator might ask you to set the certificate checking mode in Horizon Client to make sure that you can successfully connect to a server. At some companies, an administrator might set the certificate checking mode and prevent you from changing it in Horizon Client.

Server certificate checking occurs for connections between Horizon Client and a server. A certificate is a digital form of identification, similar to a passport or a driver's license.


  1. Start Horizon Client.
  2. Click the Options menu on the Horizon Client menu bar and select Configure SSL.
  3. Select the certificate checking mode.



    Never connect to untrusted servers

    This setting means that you cannot connect to the server if any of the certificate checks fail. An error message lists the checks that failed.

    Warn before connecting to untrusted servers

    This setting means that you can click Continue to ignore the warning if a certificate check fails because the server uses a self-signed certificate. For self-signed certificates, the certificate name is not required to match the server name that you entered in Horizon Client.

    You can also receive a warning if the certificate has expired.

    Do not verify server identity certificates

    This setting means that no certificate checking occurs.

  4. To save your changes, click OK.

What to do next

If you receive a certificate error after setting the certificate checking mode, contact your system administrator.