I am using Jsch with the ant <sshexec/> task. Under Java 1.6 I never had a problem. Our company recently migrated to Java 1.7
We are getting often - maybe once in 100 invocations - a failure with a "verify: false" error.
I have added more information about that on the bug tracker of jsch  and in stack overflow .
I am interested by any information concerning how to fix or workaround this problem.