Thread:Extension talk:Collection/RuntimeError: could not get siteinfo

I have 2 environments that I (hope) think are identical. They are both setup with:

MW 1.25alpha PHP 5.3.17 Collection 1.7.0 (1618025)

In the Dev environment, Collection works perfectly. In the Prod environment, I'm seeing this error:

>> failed with RuntimeError

creating nuwiki in u'/u1/wiki_pdf/cache/2e/2e58aa5a7230f6a6/tmpJuZHDI/nuwiki' ERR:  ERR:  ERR:  ERR:  removing tmpdir u'/u1/wiki_pdf/cache/2e/2e58aa5a7230f6a6/tmpJuZHDI' memory used: res=18.2 virt=152.7 1% error Traceback (most recent call last): File "/usr/local/bin/mw-zip", line 9, in        load_entry_point('mwlib==0.15.14', 'console_scripts', 'mw-zip') File "/usr/local/lib64/python2.6/site-packages/mwlib/apps/buildzip.py", line 155, in main make_zip(output, options, env.metabook, podclient=podclient, status=status) File "/usr/local/lib64/python2.6/site-packages/mwlib/apps/buildzip.py", line 50, in make_zip make_nuwiki(fsdir, metabook=metabook, options=options, podclient=podclient, status=status) File "/usr/local/lib64/python2.6/site-packages/mwlib/apps/make_nuwiki.py", line 192, in make_nuwiki pool.join(raise_error=True) File "/usr/local/lib64/python2.6/site-packages/gevent/pool.py", line 98, in join raise greenlet.exception RuntimeError: could not get siteinfo in function system, file /usr/local/lib64/python2.6/site-packages/mwlib/nslave.py, line 64

So it's failing on the start_fetcher.run method, but I can't seem to figure out why. Is this likely some system configuration thing?