The forum has problems being reached over ipv6. So people with dual-stack or ipv6-only might experience some outages. It was reported here: help.nextcloud.com problem with SSL & ipv6 · Issue #1411 · nextcloud/nextcloud.com · GitHub
here the problem with missing secured protocols:
https://www.ssllabs.com/ssltest/analyze.html?d=help.nextcloud.com&latest
@Daphne: Can you help us to reach out to the infrastructure team at Nextcloud?
Did you try searching and asking on the very helpful https://community.letsencrypt.org/
Possibly also https://meta.discourse.org/
https://community.letsencrypt.org/search?q=PR_END_OF_FILE_ERROR
https://community.letsencrypt.org/search?q=SSL_ERROR_SYSCALL%20in%20connection
another important issue infrastructure team could take a look: login with google doesn’t work since months
maybe it’s related to TLS or IPv6 as well…
Possible the Google Oauth token expired and just needs to be addressed (on the Google account that set it up)
hey! I reached out to my colleagues and they told me that there was a problem last Saturday and that it’s resolved
Thanks, it’s working again 
Problem seems to appear again. Can’t connect via IPv6… SSLLabs can’t cannot connect either