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-   -   FAQ: What causes the "No compatible cipher" error in SecureCRT? (https://forums.vandyke.com/showthread.php?t=13274)

bgagnon 10-02-2018 01:59 PM

FAQ: What causes the "No compatible cipher" error in SecureCRT?
 
2 Attachment(s)
If you are getting some form of the below error in SecureCRT:
Key exchange failed.
No compatible cipher.
The server supports these ciphers: ChaCha20-Poly1305,AES-128-CTR,AES-192-CTR,AES-256-CTR,AES-128-GCM,AES-256-GCM


https://forums.vandyke.com/attachmen...achmentid=1605
You can turn on Trace Options output (File menu) and find this info:
Code:

[LOCAL] : Available Remote Send Ciphers = chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
[LOCAL] : Selected Send Cipher = aes256-ctr
[LOCAL] : Available Remote Recv Ciphers = chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
[LOCAL] : Selected Recv Cipher = aes256-ctr

https://forums.vandyke.com/attachmen...achmentid=1601

Ciphers: The "Available" lists what the remote is advertising it supports. SecureCRT will try its listed cipher methods (in the Connection / SSH2 / Advanced category of Session Options) in order. The list can be reordered using the Up/Down arrow buttons next to the list.
https://forums.vandyke.com/attachmen...achmentid=1604
As of version 8.5.1, current Ciphers supported are (with version when support was first added):
ChaCha20-Poly1305 (v8.3.x)
AES-256-GCM (v8.3.x)
AES-128-GCM (v8.3.x)
AES-256-CTR (v6.1.x)
AES-192-CTR (v6.1.x)
AES-128-CTR (v6.1.x)
AES-256 (v3.3.x)
AES-192 (v3.3.x)
AES-128 (v3.3.x)
Blowfish (v3.0.x)
Twofish (v3.0.x)
3DES (v3.0.x)
DES (v3.0.x)
RC4 (v3.0.x)

https://forums.vandyke.com/attachmen...achmentid=1601

You can employ the power of editing the Default session to enable any new ciphers in all of your existing and future sessions. Here are some links to a tip and a video that provide more details about using the Default session to make mass changes to multiple sessions:
https://www.vandyke.com/support/tips/defaultset.html
https://www.youtube.com/watch?v=5RbuZn9L48g


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