Unable to install any add-ons

    Hi,

    I've posted about this in the add-on forum already, but it looks like it pertains to all add-ons.
    Libreelec 7.90.010 on odroid C2.

    TL;DR
    Attempt to install any add-on on odroid-C2 results Kodi being unable to get the add-on file due to 403 (or potentially 404) response from the server

    Full version:
    tcpdump'ed request and response:

    Code
    23:32:17.329754 IP (tos 0x0, ttl 64, id 53815, offset 0, flags [DF], proto TCP (6), length 306)
    192.168.2.132.47258 > 188.166.147.81.80: Flags [P.], cksum 0x776d (correct), seq 1:255, ack 1, win 229, options [nop,nop,TS val 117134 ecr 3681745419], length 254: HTTP, length: 254
HEAD /8.0/Odroid_C2/aarch64/pvr.mythtv/fanart.jpg HTTP/1.1
Host: addons.libreelec.tv
User-Agent: Kodi/17.0-BETA7 (X11; Linux aarch64) LibreELEC/8.0 App_Bitness/64 Version/17.0-BETA7-Git:17.0-beta7-eed32e7
Accept: */*
Accept-Charset: UTF-8,*;q=0.8


    HTTP
    23:32:17.629695 IP (tos 0x0, ttl 43, id 9021, offset 0, flags [DF], proto TCP (6), length 176)
    188.166.147.81.80 > 192.168.2.132.47258: Flags [P.], cksum 0x8fc4 (correct), seq 1:125, ack 255, win 118, options [nop,nop,TS val 3681745494 ecr 117134], length 124: HTTP, length: 124
HTTP/1.1 404 Not Found
Date: Mon, 26 Dec 2016 10:32:17 GMT
Server: Apache
Content-Type: text/html; charset=iso-8859-1

    If I try to GET it manually I get 403 - Forbidden (instead of 404 Not found).

    Any idea what might be causing it?