Documentation for JIRA 4.2. Documentation for other versions of JIRA is available too. 
CVS :ext: ssh Jira Integration
The following information is probably only relevant to Linux/Unix/OSX/Cygwin environments.
CVS_RSH environment variable
In order to use the :ext: method for connection to CVS, the CVS_RSH environment variable needs to be set in the environment that runs JIRA. It should be set to the path to the ssh binary.
put this in your profile
CVS_RSH=`which ssh` export CVS_RSH
Problems Authorising when command line works
One user reported the following:
The problem was found to be the UsePAM directive in sshd_config on the
cvs server(Debian-Sarge) - this needs to be disabled (which it wasn't)
with the PasswordAuthentication enabled.
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