Hi, We are using Gluu Casa with client certs as alternative second factor (main second factor is supergluu) and works nicely for our Windows users. But we are unable to make it work properly for our MacOS users. In this case after we provide the certificate Gluu Server shows an error page ("Failed to authenticate"). If right after this we click backwards in our browser and repeat the process we are able to login correctly. This happens with Safari browser. Other methods like otp or supergluu work great for them. Checking auth.log the only error line we see is this: (Authenticator.java:226) - Authentication failed for 'null' There is no errors in casa.log is client cert auth supported for MacOS and Safari ?. Thank you.