Cabal can't open a TCP connection

[Simon Peyton Jones]

Spot on, Kim-Ee.  Thanks.  unsetting http_proxy fixed it.

I’m fwding to cabal-devel: it would be great that if “http_proxy” was set to “”, then it behaved just as if it was un-set.  The current behaviour is very confusing (to me anyway).

Simon

From: Kim-Ee Yeoh [mailto:ky3 at atamo.com]
Sent: 08 May 2014 14:48
To: Simon Peyton Jones
Cc: Herbert Valerio Riedel; Simon Marlow; ghc-devs at haskell.org
Subject: Re: Cabal can't open a TCP connection


On Thu, May 8, 2014 at 8:22 PM, Simon Peyton Jones <simonpj at microsoft.com<mailto:simonpj at microsoft.com>> wrote:
On a machine that doesn't need to use a proxy server, what should $http_proxy be set to?

It's a Maybe (Maybe String) problem. Blame Cabal for not ignoring an empty http_proxy. The *nix programs I've tried treat empty as unset.
The solution is: unset HTTP_PROXY.

-- Kim-Ee

________________________________
Från: Simon Peyton Jones<mailto:simonpj at microsoft.com>
Skickat: ‎2014-‎05-‎08 14:04
Till: ghc-devs at haskell.org<mailto:ghc-devs at haskell.org>
Kopia: Simon Marlow<mailto:marlowsd at gmail.com>
Ämne: Cabal can't open a TCP connection
Dear ghc-devs
Cabal can’t open a TCP connection from my Linux box.  It used to work fine.  Here’s what it says:

cabal -v3 update

Downloading the latest package list from hackage.haskell.org

Sending:

GET http://hackage.haskell.org/packages/archive/00-index.tar.gz HTTP/1.1

User-Agent: cabal-install/1.16.0.2

Host: hackage.haskell.org

proxy uri host: , port:

Creating new connection to

cabal: openTCPConnection: host lookup failure for ""



simonpj at cam-05-unx:~/code/HEAD$ cabal --version

cabal-install version 1.16.0.2

using version 1.16.0.3 of the Cabal library

simonpj at cam-05-unx:~/code/HEAD$
Can anyone help me work out what to do?  git works just fine, so the internet is connected all right.
Thanks
Simon

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