[gnutls-devel] GnuTLS | Cannot connect to https://www.openbsd.org (#984)

[Development of GNU's TLS library]

P H created an issue: https://gitlab.com/gnutls/gnutls/-/issues/984



## Description of problem:

Neither gnutls-cli nor applications linked against gnutls can connect to https://www.openbsd.org.

## Version of gnutls used:

3.6.13

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)

Arch Linux, Ubuntu 20.04

## How reproducible:

    $ gnutls-cli openbsd.org

## Actual results:

    $ gnutls-cli openbsd.org 
    Processed 150 CA certificate(s).
    Resolving 'openbsd.org:443'...
    Connecting to '129.128.5.194:443'...
    *** Fatal error: An illegal parameter has been received.

See attachments for debug output:

-   [debug-arch.log](/uploads/ab6998c302967cd7867f438f37458e6f/debug-arch.log)
-   [debug-ubuntu-2004.log](/uploads/b0f5621b87df041ad125e796e5bfecbf/debug-ubuntu-2004.log)

IIUC, this is the culprit:

    Signature algorithm RSA-SHA256 is not enabled

## Expected results:

Connection established.

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