SSL problem with some sites

A subset of my sites — six out of thirty — were inaccessible throwing ERR_SSL_VERSION_OR_CIPHER_MISMATCH. I can’t figure out what differentiates these from the rest — all have “Full” SSL/TSL mode and the DNS settings are pretty much the same across all sites.

Everything was fine until two days ago and I haven’t made any changes, but apparently the edge certificates just disappeared. I am able to reinstate these by disabling and enabling back the Universal SSL option, but this is very alarming as there’s been no warning whatsoever.

What could be the cause of these mysterious disappearances?

2 posts were merged into an existing topic: Univesal SSL renewal is broken