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This is the same problem I had last week. I also had to add:
Cipher +aes256-cbc,aes192-cbc,aes128-cbc to the same configuration file.

I was given this link by a business partner who uses IPSwitch products and their support gave it to them:
https://www.openssh.com/legacy.html




Chris Bipes
Director of Information Services
CrossCheck, Inc.

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Steinmetz, Paul via MIDRANGE-L
Sent: Tuesday, September 24, 2019 7:50 AM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxxxxxxxx>
Cc: Steinmetz, Paul <PSteinmetz@xxxxxxxxxx>
Subject: 5733SC1 PTF SI70819 upgraded OpenSSH disabling ssh-dss (DSA) public key algorithm - multiple production SFTP failing now failing

IPL with SI70819 upgraded OpenSSH disabling ssh-dss (DSA) public key algorithm.
Multiple production SFTP failing.
Unable to negotiate with xxx.xxx.xxx.xx port 22: no matching host key type found. Their offer: ssh-dss

Remote sites either need to upgrade
Or
Re-enable ssh-dss using the HostKeyAlgorithms configuration option:

ssh -oHostKeyAlgorithms=+ssh-dss user@legacyhost

or

in the configuration file

WRKLNK '/QOpenSys/QIBM/UserData/SC1/OpenSSH/etc/ssh_config'

and add these to entries to the ssh_config file.

Host somehost.example.org --> the host name you use to connect/ip address

HostKeyAlgorithms +ssh-dss

Anyone else having these issues?
Which work around have others used?


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