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SSH - Red Hat 9 / Rocky Linux - ssh connection to old client: Bad server host key: Invalid key length

problem: you want to connecto to a legacy / old client something like an old switch > but you get the message: Bad server host key: Invalid key length
>> you probably need to allow key lenght with 1024, the default is >= 2024

things you can do:
- update-crypto-policies --set DEFAULT:SHA1

create a file: /etc/ssh/ssh_config.d/my.conf
Ciphers=+3des-cbc
RSAMinSize=1024

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