we are getting error while setting up node in jenkins and our system is centos 7.x and ssh ciphers are used has only following two : 

aes256-gcm@openssh.com,aes128-gcm@openssh.com

ssh via command line works fine. : ssh -c  aes256-gcm@openssh.com <hostname> 

somehow,  via jenkins ssh agents plugin we are getting error. 
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 Unable to negotiate with xx.xx.xx.xx port 52596: no matching cipher found. Their offer: aes256-ctr,aes192-ctr,aes128-ctr,blowfish-ctr,aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-ctr,3des-cbc [preauth]

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we have added /etc/ssh/sshd_config and /etc/ssh/ssh_config with :

Ciphers aes256-gcm@openssh.com,aes128-gcm@openssh.com

1. How can we use above ciphers to connect to node via ssh using ssh agent plugin ?
2. Are these ciphers supported ?