You need to access sagemath.org with is now on the fastly cdn (via github). 
Its almost certainly geo-specific ip and subject to change without notice. 
IMHO you can't reasonably assume that special IP numbers work.


On Friday, June 19, 2015 at 3:59:32 PM UTC+2, Christian Stump wrote:
>
> I work on a sage development branch on a machine behind a firewall. That 
> firewall doesn't allow me to contact any IPs, except if I whitelisted it.
>
> Until recently, that was not a big deal when doing development there, the 
> servers I needed to contact were
>
>     sagemath.org
>     git.sagemath.org
>     trac.sagemath.org
>     pypi.python.org
>     code.l.google.com (with alias code.google.com)
>     boxen.math.washington.edu
>
> Since these had relatively stable IPs, I whitelisted their IPs, and 
> everything worked out well.
>
> Yesterday, I wanted to recompile Sage there in order to have a patchbot 
> running there, and it killed itself when doing
>
>     Attempting to download package patch-2.7.1.tar.gz from mirrors
>     Downloading the Sage mirror list
>
> So that attempt tried to contact an IP that I hadn't whitelisted. My first 
> guess is the problem is that boxen has changed its IP (but I cannot do the 
> whitelisting myself, so I contacted the right person, but I might only get 
> that IP updated next week...).
>
> But since the output doesn't tell me which server was tried to be 
> contacted (in particular, I don't know if fixing the boxen IP will solve my 
> problem), I think it would be nice in general to have a list of servers 
> that are necessary to contact when compiling sage. Or is that a stupid 
> request?
>
> Thanks, Christian
>

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