[gnutls-devel] GnuTLS | Cannot connect to github.com, download.mono-project.com (#990)

[Development of GNU's TLS library]

Maarten Boekhold commented on a discussion: https://gitlab.com/gnutls/gnutls/-/issues/990#note_349149207

I think I've got deeper. I was studying the captures of the GnuTLS vs OpenSSL network traffic (posted earlier), and I noticed a difference in the "Key Share extension". OpenSSL only advertises "x25519", while GnuTLS also advertises "secp256r1". So I ran:

```
gnutls-cli github.com --priority=NORMAL:-GROUP-SECP256R1
```

I'll now go and try to figure out how I can set up a web server somewhere with TLSv1.3 and SECP256R1 enabled...

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