Certificate error on dyn.dns.he.net since 2018-12-09

[CootesNest]

I don't know if this is my setup, but, between 18:13 and 19:13 on the above date, my cron job to refresh the ip address stopped working with the following error:
```
curl: (51) SSL: no alternative certificate subject name matches target host name 'dyn.dns.he.net'

```
I think that the issue may be a missing (at least as far as cron 7.55.1 is concerned) Subject Alt Name in the certificate.

One oddity: the command succeeds with `-6`, but not with `-4`:
`curl -4  "https://<my loging>:<pwd>@dyn.dns.he.net/nic/update?hostname=<fqdn>"`

[CootesNest]

Unfortunately, the url seems to have stopped working altogether, now over ipv4, which makes updating dynamic ip messier.

Is this a known service issue?

tc