I'm using Calibre 2.77.0 on both platforms.
The Economist recipe works perfectly fine on my PC, but doesn't work on my Mac.
I've already tried to:
disable any firewall
disable any possible proxy
upgrade openssl
upgrade python 2.7
Nothing worked.
I would be grateful for any help.

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Python function terminated unexpectedly: <urlopen error [Errno 54] Connection reset by peer>
InputFormatPlugin: Recipe Input running
Using custom recipe
Traceback (most recent call last):
File "/Applications/calibre.app/Contents/Resources/Python/lib/python2.7/site.py", line 154, in main
return run_entry_point()
File "/Applications/calibre.app/Contents/Resources/Python/lib/python2.7/site.py", line 114, in run_entry_point
return getattr(pmod, func)()
File "site-packages/calibre/utils/ipc/worker.py", line 195, in main
File "site-packages/calibre/gui2/convert/gui_conversion.py", line 26, in gui_convert
File "site-packages/calibre/ebooks/conversion/plumber.py", line 1064, in run
File "site-packages/calibre/customize/conversion.py", line 245, in __call__
File "site-packages/calibre/ebooks/conversion/plugins/recipe_input.py", line 119, in convert
File "site-packages/calibre/web/feeds/news.py", line 1001, in download
File "site-packages/calibre/web/feeds/news.py", line 1168, in build_index
File "<string>", line 81, in parse_index
File "<string>", line 86, in economist_parse_index
File "site-packages/calibre/web/feeds/news.py", line 658, in index_to_soup
File "site-packages/mechanize/_mechanize.py", line 199, in open_novisit
File "site-packages/mechanize/_mechanize.py", line 230, in _mech_open
File "site-packages/mechanize/_opener.py", line 193, in open
File "site-packages/mechanize/_urllib2_fork.py", line 344, in _open
File "site-packages/mechanize/_urllib2_fork.py", line 332, in _call_chain
File "site-packages/mechanize/_urllib2_fork.py", line 1142, in http_open
File "site-packages/mechanize/_urllib2_fork.py", line 1118, in do_open
urllib2.URLError: <urlopen error [Errno 54] Connection reset by peer>