In the log I can see this but I don't know if it is the cause of the failure:
* Hostname blog.backyardworlds.org was found in DNS cache * Trying 192.0.78.12... * TCP_NODELAY set (21.395000) frontends/atari/gui.c:142 atari_poll: WM: 30 (21.395001) content/fetchers/curl.c:1162 fetch_curl_poll: Curl file descriptor states (maxfd=10): (21.395002) content/fetchers/curl.c:1181 fetch_curl_poll: fd 10: write * Connected to blog.backyardworlds.org (192.0.78.12) port 443 (#2) * ALPN, offering http/1.1 * Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH * successfully set certificate verify locations: * CAfile: ./res/cabundle CApath: ./res/certs (25.400002) content/fetchers/curl.c:1162 fetch_curl_poll: Curl file descriptor states (maxfd=10): (25.400003) content/fetchers/curl.c:1181 fetch_curl_poll: fd 10: read (25.415000) content/fetchers/curl.c:1162 fetch_curl_poll: Curl file descriptor states (maxfd=10): (25.415001) content/fetchers/curl.c:1181 fetch_curl_poll: fd 10: read (25.415006) content/fetchers/curl.c:1162 fetch_curl_poll: Curl file descriptor states (maxfd=10): (25.415007) content/fetchers/curl.c:1181 fetch_curl_poll: fd 10: read (25.430000) content/fetchers/curl.c:1162 fetch_curl_poll: Curl file descriptor states (maxfd=10): (25.430001) content/fetchers/curl.c:1181 fetch_curl_poll: fd 10: read * error:1407743E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert inappropriate fallback * Closing connection 2 (28.345000) content/fetchers/curl.c:1052 fetch_curl_done: done https://blog.backyardworlds.org/2018/02/14/we-love-you-and-happy-anniversary/ (28.345001) content/fetchers/curl.c:1097 fetch_curl_done: Unknown cURL response code 35 (28.350000) content/fetchers/curl.c:811 fetch_curl_stop: fetch 0x1ab0b14, url 'https://blog.backyardworlds.org/2018/02/14/we-love-you-and-happy-anniversary/' (30.140001) content/fetchers/curl.c:1162 fetch_curl_poll: Curl file descriptor states (maxfd=-1): (30.145000) frontends/atari/rootwin.c:108 handle_event: WM_REDRAW (30.145001) frontends/atari/gui.c:142 atari_poll: WM: 20