How to support older protocols even though they are not secure

[java-walker]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest version
• Search the existing issues.

Steps to reproduce

C:\Users\user>ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 -l didi 10.0.7.1
Unable to negotiate with 10.0.7.1 port 22: no matching host key type found. Their offer: ssh-rsa

Expected behavior

%Trying 10.0.7.1, 22,...open
didi@10.0.7.1's password:

Actual behavior

Unable to negotiate with 10.0.7.1 port 22: no matching host key type found. Their offer: ssh-rsa

Error details

Environment data

PS C:\Users\XX> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      5.1.26100.1591
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.26100.1591
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Version

PS C:\Users\XX> ssh -V OpenSSH_for_Windows_9.5p1, LibreSSL 3.8.2

Visuals

No response

[java-walker]

I cloud use putty login it

[java-walker]

PS C:\Users\user> ssh -o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedKeyTypes=+ssh-rsa -o MACs=+hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96 -o StrictHostKeyChecking=no -l user 10.0.7.1
ssh_dispatch_run_fatal: Connection to 10.0.7.1 port 22: Invalid key length

[StevenBucher98]

@java-walker if you are able to get onto the server can you regenerate a hostkey with the proper length and try to ssh again?

Also what version of ssh server are you using?