Algorithm negotiation fail - JSchException:

Asked Jan 09 '18 at 10:26

Active Jan 09 '18 at 10:26

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I am getting below exception when my application tries to connect to particular switch.

com.jcraft.jsch.JSchException: Algorithm negotiation fail

Connection to other switch is possible but, one particular switch fails. What can be possible reason? I am getting exception at this line of code:

session.connect(30000);

Output of my logs:

null Connecting to NDELEVDA0001 port 22
null Connection established
null Remote version string: SSH-2.0-OpenSSH_7.2 FIPS
null Local version string: SSH-2.0-JSCH-0.1.43
null CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
null aes256-ctr is not available.
null aes192-ctr is not available.
null aes256-cbc is not available.
null aes192-cbc is not available.
null arcfour256 is not available.
null SSH_MSG_KEXINIT sent
null SSH_MSG_KEXINIT received
null Disconnecting from NDELEVDA0001 port 22
com.jcraft.jsch.JSchException: Algorithm negotiation fail

asked Jan 09 '18 at 10:26

NobesInd

+ You are using an ancient version of JSch, you need to upgrade. – Martin Prikryl Jan 09 '18 at 10:58
But, other switches are getting connection. so how come jsch version affect only single switch? :( – NobesInd Jan 09 '18 at 12:43
+ What is duplicate of jsch algorithm? – NobesInd Jan 09 '18 at 12:44
Because that switch is has probably a different version of OpenSSH. – Martin Prikryl Jan 09 '18 at 12:48
Your question is duplicate of the question linked in my first comment. – Martin Prikryl Jan 09 '18 at 12:48
Issue is resolved. I had imported jsch 0.1.54 jar but it was not picking the correct jar. Issue is resolved by upgrading the jsch jar – NobesInd Jan 09 '18 at 14:00

Algorithm negotiation fail - JSchException:

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