Re: GNU Elpa not reachable (possibly OT)

[Eli Zaretskii <eliz@gnu.org>]

> From: Joost Kremers <joostkremers@fastmail.fm>
> Date: Mon, 18 Feb 2019 15:58:19 +0100
> 
> error in process filter: Error retrieving: 
> https://elpa.gnu.org/packages/archive-contents (error http 400)
> 
> Funny thing is, I can paste that URI in the address bar of my 
> browser and the file loads just fine. 
> 
> Looking at this reddit page:
> 
> https://www.reddit.com/r/emacs/comments/arnbhb/cant_reach_elpa_for_the_last_couple_of_days/
> 
> I tried the same thing as in one of the posts there, and indeed, 
> `nslookp elpa.gnu.org` gives me:
> 
> 
> ```
> Non-authoritative answer:
> Name:   elpa.gnu.org
> Address: 209.51.188.89
> Name:   elpa.gnu.org
> Address: 2001:470:142:5::89
> ```
> 
> and then `ping elpa.gnu.org` yields:
> 
> ```
> PING elpa.gnu.org(2001:470:142:5::89 (2001:470:142:5::89)) 56 data 
> bytes
> >From 2001:470:142::1 (2001:470:142::1) icmp_seq=1 Destination 
> unreachable: Address unreachable
> ```
> 
> Several IPv6 test sites tell me my IPv6 connectivity is fine, 
> except for one, which states that "Your router or firewall is 
> filtering ICMPv6 messages sent to your computer."
> 
> So I'm wondering if that may be the cause of the problem and if 
> yes, what can I do about it?

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