Citrix ADC: SSH is not working

• Both Primary and Secondary ADCs were not accessible via ssh/sftp/ftp/scp
• After ssh into secondary and got the below error:

• Only console access was available  and could not find any error due to continuous messages on the console. However output of cat sshd_config was able to confirm that PaaswordAuthetication was set to No
• Unable to edit using editors due to a lot of console messages.
• Tried command by typing in letters one by one continuously onto the console: more sshd_config | grep -v 'PasswordAuthentication no' >> sshd_confifg.1
   
• Using this command we saved everything from sshd_config (excluding line: PasswordAuthentuication No) into sshd_config.1
  
  Added a line into sshd_config.1
  
  using echo command: echo "PasswordAuthentication Yes" >> sshd_config.1
• Deleted sshd_config file: rm sshd_config
• Renamed sshd_config.1 to sshd_config: mv sshd_config.1 sshd_config 
• Killed sshd: ps -aux | grep sshd Took process ID from there and ran the command: kill <P.ID>
  
  After few seconds, ssh was working for secondary node

• On primary node sshd_config was empty.
• Used sshd_config.aws 
• Copied ssh_config.aws data into sshd_config: cp sshd_config.aws sshd_config
• Started the SSH daemon by using the command below: /etc/sshd start
• We received same error that we received in secondary unit.
• Unable to edit using editors due to a lot of console messages.
• Tried command by typing in letters one by one continuously onto the console: more sshd_config | grep -v 'PasswordAuthentication no' >> sshd_confifg.1
   
• Using this command we saved everything from sshd_config (excluding line: PasswordAuthentuication No) into sshd_config.1
  
  Added a line into sshd_config.1
  
  using echo command: echo "PasswordAuthentication Yes" >> sshd_config.1
• Deleted sshd_config file: rm sshd_config
• Renamed sshd_config.1 to sshd_config: mv sshd_config.1 sshd_config 
• Killed sshd: ps -aux | grep sshd Took process ID from there and ran the command: kill <P.ID>
• After few seconds we were able to SSH/winscp/FTP/SCP into primary node as well.
  
  
  NOTE: Make a Backup of new sshd_config by copying it into nsconfig: cp sshd_config ../nsconfig.
  Create a soft link if possible

Problem Cause

Broken sshd file and need to restore the previous file in order to make it work.