SSH_VMS

Problem on MAC making ssh connection to VMS:
"Unable to negotiate with x.x.x.x port 22: no matching key exchange found. Their offer diffie-hellman-group1-sha1"

Solution: On the MAC, invoke Terminal Window,

Edit ssh.config. using nano editor :
$ sudo nano /etc/ssh/ssh_config
(Enter MAC admin password)

Locate line & remove # at beginning:
# MACs hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160
Locate line & remove # at beginning:
# Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc’

Add lines :
HostkeyAlgorithms ssh-dss,ssh-rsa
KexAlgorithms +diffie-hellman-group1-sha1

Exit nano ; MAC reboot not needed.

Reference : https://www.petenetive.com/KB/Article/0001245

VMS.X to MAC.X

Enabling MAC.ssh to VMS.X11 Clients :

Edit MAC's ssh_config & add lines
Host*
ForwardX11 yes
XAuthLocation /opt/X11/bin/xauth