I go to the job-import page, put in the URL of my current Jenkins server and hit query and no list is produced. The curious thing is that in the upper right, the "New Job" icon text is changed to "New null". I've tried different URLs ( like https://server and https://server/view/something ) but all produce the same result.
The current server is behind a remote lighthttpd proxy on port 443; similarly the new server is behind an Apache reverse proxy at 443. The new server is Jenkins ver. 1.466.1 on Java 1.6.0_24 on Ubuntu 12.04 (using Jenkins deb). The current server is Jenkins ver. 1.406 on Java 1.6.0_0 on CentOS 5.5 (with Jenkins installed upgraded from Hudson 1.363-1.1 rpm)