When a certificate is removed or added to the SSL or NetScaler Gateway virtual server, the warning message, “No usable ciphers configured on the SSL vserver/service” is displayed.

This warning message appears when ciphers on the virtual server cannot be used because there is no certificate key pair bound to the virtual server. If you have a certificate bound to the virtual server then you can ignore this warning message.

This warning message also appears when you add a new certificate. When you add the certificate, the GUI of the NetScaler appliance runs the unbind command to unbind the certificate being removed and then runs the command for adding another certificate. Since for some duration there is no certificate bound to the virtual server this error message is shown.