It seems possible to access Phabricator from a Tor session for global IP block exempt accounts, but it seems inconsistent. Either it works transparently, exactly the same as a non-Tor session, or the page for error 500 is returned even when logged in to mediawiki and main wikimedia sites using SUL.
Is this a known error, and is there a work-around to enable SUL accounts with global IP block exempt accounts to access Phabricator consistently from Tor?