Thanks. I already removed my domain from CF.
I am not sure what happened. It is my fault also I was away my site went offline for 11 hours and I don’t know what is wrong. My webserver is accessible on my other monitoring so it means nothing is wrong on my side since server is accessible.
It was working fine for 3 months and I was confused what happened. I did not change any settings to my website. Maybe the fault is I was using a self signed cert and CF did not like that. that is why it cause error after your upgrade.