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

[Development of GNU's TLS library]

Daiki Ueno commented:


> OpenSSL-linked curl works fine [...]

I guess the best way to diagnose this kind of issues would be to do a packet capture and compare the exchanged messages. That may require enabling decryption, which should be possible through the keylog file feature.

Here is a tshark command line I use:
```console
$ tshark -o "tls.desegment_ssl_records: TRUE" \
         -o "tls.desegment_ssl_application_data: TRUE" \
         -o "tls.keylog_file: $PWD/keylog.txt" \
         -i lo -Px -O tls -Y "tcp.port == 443"

$ SSLKEYLOGFILE=$PWD/keylog.txt gnutls-cli ...
$ openssl s_client -keylogfile $PWD/keylog.txt -connect ...
```

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