com.jcraft.jsch.JSchException: Auth cancel
Solution 1
I debugged the code. This was failing because my private key was failing authentication; JSch silently fell back to password authentication, which was canceled, because I didn't specify a password.
JSch error handling sucks a lot. Retrace your steps, regenerate a (separate) private key file, use ssh -i
to guarantee you're using the right file, and keep your fingers crossed.
Solution 2
To get the jsch
connection to work, you must specify the paths to both the known_hosts
file and to the file containing the private key. This is done using the setKnownHosts
and addIdentity
methods.
jsch.setKnownHosts("/path/to/.ssh/known_hosts");
jsch.addIdentity("/path/to/.ssh/id_rsa");
If the key has a passphrase, you can add it to the addIdentity
argument list:
jsch.addIdentity("/path/to/.ssh/id_rsa", myPassPhrase);
Solution 3
I had the same issue while using sshexec task. I added passphrase attibute too and it worked fine. create a passphrase for your private key and add this as a attribute in your task. Also don't forget to convert your private key to open ssh format if you generated the key using puttygen on windows.
Solution 4
I had a similar Issue today. So i thought i will share my solution aswell. I got the same exception but the problem was in fact that i had a umlaut within my password. after choosing a new password without it everything worked fine.
Dan Fabulich
Updated on July 09, 2022Comments
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Dan Fabulich almost 2 years
I'm trying to write an Ant script to retrieve an URL via port tunnelling.
It works great when I use a password (the names xxxx'd out for privacy):
<project default="main"> <target name="main"> <sshsession host="xxxx" username="xxxx" password="xxxx"> <LocalTunnel lport="1080" rhost="xxxx" rport="80"/> <sequential> <get src="http://localhost:1080/xxxx" dest="/tmp/xxxx"/> </sequential> </sshsession> </target> </project>
But it doesn't work when I use a keyfile, like this:
<sshsession host="xxxx" username="xxxx" keyfile="/Users/xxxx/.ssh/id_dsa" passphrase="xxxx"> <LocalTunnel lport="1080" rhost="xxxx" rport="80"/> <sequential> <get src="http://localhost:1080/xxxx" dest="/tmp/xxxx"/> </sequential> </sshsession>
I get this exception:
/tmp/build.xml:8: com.jcraft.jsch.JSchException: Auth cancel at com.jcraft.jsch.Session.connect(Session.java:451) at com.jcraft.jsch.Session.connect(Session.java:150) at org.apache.tools.ant.taskdefs.optional.ssh.SSHBase.openSession(SSHBase.java:223)
- I'm sure I'm using the correct keyfile (I've tried using the wrong name, which gives a legitimate FileNotFoundException).
- I can successfully ssh from the command line without being prompted for a password.
- I'm sure I'm using the correct passphrase for the keyfile.
What's the cause of this error and what can I do about it?
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opticyclic about 11 yearsThis statement contradicts what is written on this issue saying that vngx-jsch is not a drop in replacement for the ant task github.com/vngx/vngx-jsch/issues/10
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Scott about 11 yearsThis comment does not in any way suggest that it is a drop in replacement ...It says if something does work the way you expect, that is means based on the documentation NOT based on JSCH. Hence the first line : There is a brand new FORK of Jsch out now. The issue was closed because it is working as designed.