On 2024-03-04 11:16:14 [+0100], Maciej Bogucki wrote:
>   When I invoke `/usr/bin/openssl s_client -connect 192.168.92.95:636`

So you get no reply? That is odd. There has to be reply. A "Connected"
line is something I would have expected. If there is nothing then I
would assume that the port is silently blocked.

…
> from latest rocky linux it is ok
> 
> [bogucki@nsd-ansible ~]$ /usr/bin/openssl  s_client -connect 192.168.92.95:636
> CONNECTED(00000003)

see, that line is missing.

…
> No client certificate CA names sent
> Client Certificate Types: RSA sign, DSA sign, ECDSA sign
> Requested Signature Algorithms: 
> RSA+SHA512:ECDSA+SHA512:RSA+SHA256:RSA+SHA384:RSA+SHA1:ECDSA+SHA256:ECDSA+SHA384:ECDSA+SHA1
> Shared Requested Signature Algorithms: 
> RSA+SHA512:ECDSA+SHA512:RSA+SHA256:RSA+SHA384:RSA+SHA1:ECDSA+SHA256:ECDSA+SHA384:ECDSA+SHA1
> Peer signing digest: SHA1
> Peer signature type: RSA

The remote side looks limited. So from all the possibilities it decided
to sign with RSA+SHA1. This is something openssl in bookworm rejects if
I am not mistaken. But there has to be an error message about this.

If *think* if you lower security level then it should work.

Out of curiosity, what is the remote side running?

Sebastian

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