Access to the old Acc6 System

This site describes, how to access the old Acc6 System, for maintenance purposes or in order to run old applications remotely. Please follow the steps described below.

Steps how to access Acc6

• You first need to login to one of the new Acc9 machines asl75x.acc.gsi.de (please choose one of the following: asl751 .. asl755).
  From Windows, this is done using the Remote Desktop application (press the Windows Button and type mstsc ("Microsoft Terminal Services Client"))
• On Acc9, open a Terminal from the Menu: Applications -> Terminal Emulator
• Only for the first time, you need to setup your ssh specifically for connecting to the old Acc6 System. This is done once and described below.
• Using the terminal, we login to the old Acc6 System by calling
  

  OPENSSL_CONF=~/.ssh/my-openssl.cnf ssh -Y asl335.acc.gsi.de

• On the Acc6 System, we can e.g. start the old IonSource Program:
  

  /tmp/IQ.run.sh &

SSH configuration for allowing access to Acc6 (done once on the new Acc9 cluster)

SSH config

In the .ssh/config file, we have to add the following section. If the file does not exist yet, we create it:

gedit ~/.ssh/config

add the following content:

Host asl335.acc.gsi.de
  KexAlgorithms +diffie-hellman-group14-sha1
  MACs +hmac-sha1
  HostKeyAlgorithms +ssh-rsa
  PubkeyAcceptedKeyTypes +ssh-rsa
  PubkeyAcceptedAlgorithms +ssh-rsa

Afterwards, save and close gedit.

SSL config

Then we have to create a new openssl config file, we call it my-openssl.cnf

gedit ~/.ssh/my-openssl.cnf

with the following content:

.include /etc/ssl/openssl.cnf
[openssl_init]
alg_section = evp_properties
[evp_properties]
rh-allow-sha1-signatures = yes

Afterwards, save and close gedit.

-- JuttaFitzek - 27 Mar 2023