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Referred here by Network Engineering Stack Exchange.

I am having a D-link 1510-28 switch to which I am trying to SSH into.

Upon trying the command: 

srajan@srajan-Virtual-Machine:~$ ssh admin@10.82.64.5
Unable to negotiate with 10.82.64.5 port 22: no matching cipher found. Their offer: 3des-cbc,blowfish-cbc,twofish-cbc,twofish256-cbc,twofish192-cbc,twofish128-cbc,aes256-cbc,aes192-cbc,aes128-cbc,arcfour,cast128-cbc

I also tried upgrading it to the latest firmware available, but to no avail. After googling, I tried using this 

srajan@srajan-Virtual-Machine:ssh -c aes256-cbc admin@10.82.64.5
Received disconnect from 10.82.64.5 port 22:3: Disconnected: Key exchange or Algorithm Negotiation failed
Disconnected from 10.82.64.5 port 22

As suggested on NE Stack Exchange comments, I also tried this but received the same error.

C:\Users\xyz>ssh -c aes256-cbc -oKexAlgorithms=+diffie-hellman-group1-sha1 admin@10.82.64.5
Received disconnect from 10.82.64.5 port 22:3: Disconnected: Key exchange or Algorithm Negotiation failed
Disconnected from 10.82.64.5 port 22

I have attached the full debug log here as this site considers it as spam. Full Debug log

EDIT: The second command verbose log can be found here.

Please help.

Srajan Soni
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1 Answers1

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I was able to solve it by changing the RSA key length on the switch from 768 bit to 2048 bit Host key. The error stopped showing up after this!

Srajan Soni
  • 11
  • 1
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