Legacy SSH Enabler - Allow your newer OpenSSH client and server to talk with older SSH clients and servers, system-wide.

[alex_free]

Legacy SSH Enabler fixes errors encountered when using a newer OpenSSH client to connect to an older SSH server (i.e. Unable to negotiate with 10.0.0.72 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1). It also fixes errors encounter when using an older SSH client to connect to a newer OpenSSH server (i.e. no kex alg).

| Github |

Table Of Contents​

• Downloads
• Usage
• Before Legacy SSH Enabler
• After Legacy SSH Enabler
• Why Is This Needed?
• How Does This Work?

The coolest thing I've done with this has to be opening/reading/writing files on my iBook G4 running tiger, using Gnome files on my Linux laptop over sftp with visual studio code as the editor:

 

[barracuda156]

Legacy SSH Enabler fixes errors encountered when using a newer OpenSSH client to connect to an older SSH server (i.e. Unable to negotiate with 10.0.0.72 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1). It also fixes errors encounter when using an older SSH client to connect to a newer OpenSSH server (i.e. no kex alg).

| Homepage | Github |

Table Of Contents​

• Downloads
• Usage
• Before Legacy SSH Enabler
• After Legacy SSH Enabler
• Why Is This Needed?
• How Does This Work?

The coolest thing I've done with this has to be opening/reading/writing files on my iBook G4 running tiger, using Gnome files on my Linux laptop over sftp with visual studio code as the editor:


View attachment 2432115View attachment 2432116

Not directly related, but in case: do you know how to make tmate work on ppc?
Upstream is silent: https://github.com/tmate-io/tmate/issues/305

 

[alex_free]

Not directly related, but in case: do you know how to make tmate work on ppc?
Upstream is silent: https://github.com/tmate-io/tmate/issues/305

I don't know much about tmate (or tmux), but I would try to connect two PowerPC macs together using your built executable. If that works, it is highly likely that if you use something like legacy ssh enabler it will allow you to also connect to modern Linux distributions. I believe this because I think this involves ssh (correct me if I'm wrong).

 

[alex_free]

Not directly related, but in case: do you know how to make tmate work on ppc?
Upstream is silent: https://github.com/tmate-io/tmate/issues/305

Ignore my previous reply. Latest tmux does have a tiger patch as referenced by https://github.com/macports/macports-ports/blob/master/sysutils/tmux/Portfile so maybe that will point you in the right direction.

 

[barracuda156]

Ignore my previous reply. Latest tmux does have a tiger patch as referenced by https://github.com/macports/macports-ports/blob/master/sysutils/tmux/Portfile so maybe that will point you in the right direction.

Everything is tmux portfile deals with fixing build errors, and we got no problems with building tmate currently. So unfortunately, that won’t help. (The patch in the portfile is mine btw, added in this commit.)

 

[alex_free]

I can't believe this. It works on Mac OS 12.7.4 as is. Download the zip file, make sure the garbage that is SIP is disabled, and run it like normal.

 

[alex_free]

Version 1.0.1 (3/6/2025) ​

Changes:

• Implemented proper support for RedHat Linux distros (Fedora, CentOS, RHEL). RSAMinSize is now set to 768, and update-crypto-policies is now set to LEGACY.
• It works on Mac OS! It already did, but I didn't expect it to or document it (just needs SIP disabled).