#550: bad error message when proxy cannot be resolved ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: defect | Status: new Priority: low | Milestone: Component: cabal-install tool | Version: Severity: minor | Keywords: Difficulty: easy (<4 hours) | Ghcversion: Platform: | ---------------------------------+------------------------------------------ As reported by a user: {{{ when I run cabal update I get some strange error: % cabal update Downloading the latest package list from hackage.haskell.org cabal: user error (openTCPConnection: host lookup failure for "") }}} Turns out the problem was that `http_proxy` environment variable was set to "" (ie the empty string). The problem with the error of course is that we've no idea what it is it thinks is "", there's no indication that it's the proxy. If it said that it encountered the problem while contacting the proxy that'd be an improvement. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/550 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects