I met the same issue described in this VMware KB, unfortunately none of the solutions worked for me.
- When logging in with the vSphere Client you see a Security Warning dialog with a message similar to:An untrusted SSL certificate is installed on “<hostname>” and secure communication cannot be guaranteed. Depending on your security policy, this issue might not represent a security concern. You may need to install a trusted SSL certificate on your server to prevent this warning from appearing.
- You cannot click any of the dialog buttons or move the dialog window.
But I figured out a workaround that solved the problem for me – Add ‘-i‘ to ignore the certificate check. You can either run it through command line or add it into the shortcut.