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I was migrating to a new server running Rocky Linux 9.4 and everything is working good. D3 installed, Cups working, migrated all Linux users, etc.

When using Putty SSH it all works.

But when I try to connect via AccuTerm 8 Secure Shell SSH version: auto, I get:

No supported signature scheme exists (SSH).  -   and when I click to view details it says.

No supported SSH2 signature scheme exists. The list of supported signature schemes received from the remote host does not contain a scheme supported by the local machine. SSH_ERROR_UNSUPPORTED_SIGN). Note: Accuterm's SSH2 implementation supports "ssh-dss'" and "ssh-rsa" signature schemes.



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Steve Shourds
VP
Perfection Software Inc
North Palm Beach FL US
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I was migrating to a new server running Rocky Linux 9.4 and everything is working good. D3 installed, Cups working, migrated all Linux users, etc.

When using Putty SSH it all works.

But when I try to connect via AccuTerm 8 Secure Shell SSH version: auto, I get:

No supported signature scheme exists (SSH).  -   and when I click to view details it says.

No supported SSH2 signature scheme exists. The list of supported signature schemes received from the remote host does not contain a scheme supported by the local machine. SSH_ERROR_UNSUPPORTED_SIGN). Note: Accuterm's SSH2 implementation supports "ssh-dss'" and "ssh-rsa" signature schemes.



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Steve Shourds
VP
Perfection Software Inc
North Palm Beach FL US
------------------------------

Rocket is saying AccuTerm 8.0.x is not going to work. They are forcing an upgrade to AccuTerm 8.1.1.1135

Does anyone know a workaround to get 8.0.x working? Maybe some way to downgrade Rocky to "ssh-dss" or "ssh-rsa"?

Thanks..



------------------------------
Steve Shourds
VP
Perfection Software Inc
North Palm Beach FL US
------------------------------

I was migrating to a new server running Rocky Linux 9.4 and everything is working good. D3 installed, Cups working, migrated all Linux users, etc.

When using Putty SSH it all works.

But when I try to connect via AccuTerm 8 Secure Shell SSH version: auto, I get:

No supported signature scheme exists (SSH).  -   and when I click to view details it says.

No supported SSH2 signature scheme exists. The list of supported signature schemes received from the remote host does not contain a scheme supported by the local machine. SSH_ERROR_UNSUPPORTED_SIGN). Note: Accuterm's SSH2 implementation supports "ssh-dss'" and "ssh-rsa" signature schemes.



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Steve Shourds
VP
Perfection Software Inc
North Palm Beach FL US
------------------------------

I've seen that many times where older versions of one side or the other no longer supports a particular encryption scheme.  While you probably cannot downgrade the repository package from Rocky, you could go to openssh.org, find a version that will work, build and install it in /usr/local and use that as your ssh server instead.  Then when accumterm has been upgraded to the latest crypto, you can switch back.



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Tom Marracci
General Manager
Aircraft Spruce
corona CA US
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Rocket is saying AccuTerm 8.0.x is not going to work. They are forcing an upgrade to AccuTerm 8.1.1.1135

Does anyone know a workaround to get 8.0.x working? Maybe some way to downgrade Rocky to "ssh-dss" or "ssh-rsa"?

Thanks..



------------------------------
Steve Shourds
VP
Perfection Software Inc
North Palm Beach FL US
------------------------------

I think I ran into this also.  Have you tried changing the Cryptographic policy to Legacy?



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Steve Caspers
Murphy Automotive Inc
Rosemount MN US
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I was migrating to a new server running Rocky Linux 9.4 and everything is working good. D3 installed, Cups working, migrated all Linux users, etc.

When using Putty SSH it all works.

But when I try to connect via AccuTerm 8 Secure Shell SSH version: auto, I get:

No supported signature scheme exists (SSH).  -   and when I click to view details it says.

No supported SSH2 signature scheme exists. The list of supported signature schemes received from the remote host does not contain a scheme supported by the local machine. SSH_ERROR_UNSUPPORTED_SIGN). Note: Accuterm's SSH2 implementation supports "ssh-dss'" and "ssh-rsa" signature schemes.



------------------------------
Steve Shourds
VP
Perfection Software Inc
North Palm Beach FL US
------------------------------

RSA is being deprecated due to vulnerabilities. If you look through the below link you will find some options to try server side.

I have a similar issue and have just started looking into it! I haven't played with it yet but have a look and see if there is something useful there. 

https://askubuntu.com/questions/1409105/ubuntu-22-04-ssh-the-rsa-key-isnt-working-since-upgrading-from-20-04

Cheers

Tom



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Tom Power
Owner
Power Business Systems
Benoni ZA
------------------------------

RSA is being deprecated due to vulnerabilities. If you look through the below link you will find some options to try server side.

I have a similar issue and have just started looking into it! I haven't played with it yet but have a look and see if there is something useful there. 

https://askubuntu.com/questions/1409105/ubuntu-22-04-ssh-the-rsa-key-isnt-working-since-upgrading-from-20-04

Cheers

Tom



------------------------------
Tom Power
Owner
Power Business Systems
Benoni ZA
------------------------------

I just found this and it worked. Not the best solution, but better than spending a bunch of money and time to redeploy AccuTerm. Thanks!

update-crypto-policies --set DEFAULT:SHA1


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Steve Shourds
VP
Perfection Software Inc
North Palm Beach FL US
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