Firefox因证书替换触发HSTS错误，无法访问指定网站的技术求助

大家好，我被一个问题困扰快两个月了：我常访问的xxxxx.com现在完全打不开，Firefox一打开就弹出安全提示，内容如下：

Did Not Connect: Potential Security Issue #

Firefox detected a potential security threat and did not continue to
xxxxx.com because this website requires a secure connection.

What can you do about it?

xxxxx.com has a security policy called HTTP Strict Transport Security
(HSTS), which means that Firefox can only connect to it securely. You
can’t add an exception to visit this site.

The issue is most likely with the website, and there is nothing you
can do to resolve it. You can notify the website’s administrator about
the problem.

Websites prove their identity via certificates. Firefox does not trust this site
because it uses a certificate that is not valid for xxxxx.com. The certificate is only valid for the following names: *.a6z-dns.ovh, a6z-dns.ovh

Error code: SSL_ERROR_BAD_CERT_DOMAIN

我特意查看了这个网站的证书，发现它的有效域名确实是*.a6z-dns.ovh和a6z-dns.ovh，根本不是我要访问的xxxxx.com。

有没有懂技术的朋友能帮我分析下这到底是怎么回事？有没有办法能解决这个问题，让我重新正常访问这个网站呢？

备注：内容来源于stack exchange，提问作者John Frickson