If you are using the dated SSH Secure Shell Client 3.2.9, you may have issue connect to the more updated OpenSSH Server.
If you cannot change the client (which is recommended), you will have to update the OpenSSH Server on Linux. Add this in
# vim /etc/ssh/sshd_config
# Ciphers Ciphers aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,arcfour KexAlgorithms diffie-hellman-group1-sha1
*If you are using Centrify-OpenSSH, you have to modify /etc/centrifydc/ssh/sshd_config and do the same
References:
The Linux Cluster 
THIS. It was absolutely perfect.
Thank you.
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Thanks so much, been breaking my head on this for months
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Excellent. the solution works. In my case the version of my secure shell is 3.2.9
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xcellent. the solution works , thanks a lot
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the solution works with 16.04 . thanks. for 18.04 no. do you have recommendation for 18.04? thanks
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in AIX 7.1.5 add the 2 lines in /etc/ssh/sshd_config
# vi /etc/ssh/sshd_config
Ciphers +aes128-cbc
KexAlgorithms +diffie-hellman-group1-sha1
save and exit then must be do
#stopsrc -s sshd
#startsrc -s sshd
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Thanks Mahmoud Yousef this works for me…..
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Mahmoud, Thank you so much, This has sorted me out,
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it work perfectly thanks alot
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