Cipher issue on Solaris 11.4


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Cipher issue on Solaris 11.4

Hi,

Our most of servers are on Solaris 11.2 (with no SRU). Recently I upgraded one of them to Solaris 11.4. It has to go in multiple steps, as it can not jump fro 11.2 to 11.4 in one go. After upgrading, I can not login to server with SecureCRT and it through error
Code:
key exchange failed: cipher not compatible

One of the link on internet tells me about SecureCRT that I have:
AES-128
AES-192
AES-256

But it is looking for :
AES-128-CTR
AES-192-CTR
AES-256-CTR

I noticed that SSH was upgraded on server (Sun_SSH_2.2 to OpenSSH_7.7p1) and latest update of Oracle says "The default set of ciphers and MACs has been altered to remove unsafe algorithms. You can use the following commands to list all supported ciphers". and here is output:
Code:
# ssh -Q cipher
3des-cbc
aes128-cbc
aes192-cbc
aes256-cbc
rijndael-cbc@lysator.liu.se
aes128-ctr
aes192-ctr
aes256-ctr
aes128-gcm@openssh.com
aes256-gcm@openssh.com
chacha20-poly1305@openssh.com
#

That means my SecureCRT is old and not compatible with current solaris version. Due to management budget issues, it may probably take some time to spend money on getting latest SecureCRT.

- Is there any bypass/alternate, which should be be used to login for time-being ?

Any advice would be helpful for me to read further.

Thanks

Last edited by solaris_1977; 07-31-2019 at 04:05 PM..
# 2  
I think this question was recently asked and answered here (or a very similar question).

Please search the forums before asking questions and reference those discussions (it is also a forum rule and is just good practice to read the many great posts here at unix.com before asking a question which has likely been addressed, directly or indirectly).

When you search the forums and find a relevant discussion, you will also see up to 10 related discussions at the bottom of each entry (especially easy to read now that I have remodeled this code in both desktop and mobile).

Please search the forums before asking a question, read / review the related / similar discussions, and reference the relevant discussions in your questions.

Thanks.
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