Sdformat.org not reachable from Czech Republic

Hi, I can’t access sdformat.org for at least 4 hours now (it worked last week). Pings to 54.84.92.95 do not respond. I tried from 4 different autonomous systems (all in Czech republic; one cell provider, two home broadband providers, one university provider). When I tried to ping from a cloud instance abroad, it worked, so I assume the problem is somehow geographical…

Example tracepath:

$ tracepath sdformat.org
 1?: [LOCALHOST]                      pmtu 1500
 1:  _gateway                                              0.446ms 
 1:  _gateway                                              0.445ms 
 2:  _gateway                                              0.439ms pmtu 1492
 2:  10.11.5.146                                           5.739ms 
 3:  no reply
 4:  10.80.255.1                                           6.274ms 
 5:  10.51.254.1                                           6.044ms asymm  6 
 6:  r-sitel.pe3ny.net                                     8.002ms 
 7:  82.113.32.226                                         9.843ms 
 8:  prag-b4-link.ip.twelve99.net                          6.556ms 
 9:  ffm-bb2-link.ip.twelve99.net                         12.868ms asymm 11 
10:  prs-bb2-link.ip.twelve99.net                         21.720ms asymm 12 
11:  rest-bb1-link.ip.twelve99.net                        99.202ms asymm 13 
12:  ash-b2-link.ip.twelve99.net                          99.657ms 
13:  vadata-svc077202-lag003838.ip.twelve99-cust.net      99.136ms asymm 14 
14:  no reply
15:  no reply
16:  52.93.28.170                                        103.837ms asymm 17 
17:  no reply
18:  no reply
19:  no reply
20:  no reply
21:  no reply
22:  no reply
23:  no reply
24:  no reply
25:  no reply
26:  no reply
27:  no reply
28:  no reply
29:  no reply
30:  no reply
     Too many hops: pmtu 1492
     Resume: pmtu 1492 

DNS resolution works:

$ dig sdformat.org

; <<>> DiG 9.11.3-1ubuntu1.18-Ubuntu <<>> sdformat.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37864
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;sdformat.org.			IN	A

;; ANSWER SECTION:
sdformat.org.		60	IN	A	54.81.126.77
sdformat.org.		60	IN	A	54.84.92.95

;; Query time: 11 msec
;; SERVER: 192.168.18.1#53(192.168.18.1)
;; WHEN: Mon Apr 03 23:58:45 CEST 2023
;; MSG SIZE  rcvd: 73

Accessing gazebosim.org works.

The website works for me even though I can’t ping the ip address from dig. Are you still having the issue?

Now the access from browser works. Pings still don’t, but that could be how the server is configured.

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