Timeouts in Server-to-Server Requests from Hetzner to Cloudflare Hosted Sit

We have been experiencing a persistent issue for several days involving server-to-server timeouts. We are hosting one server on Hetzner and making requests to another site, also hosted on Hetzner but configured through Cloudflare.

The timeouts appear to be related to connectivity issues from Hetzner to certain Cloudflare IP addresses, as these timeouts occur even when accessing cached responses from Cloudflare, indicating the issue is not related to our server’s processing. This leads us to suspect there might be network routing or IP connectivity problems between Hetzner and Cloudflare.

Attached are the MRT logs which show the affected IP addresses and the patterns of timeouts we are observing. Any guidance would be immensely helpful.

[xxx.it@host ~]$ mtr -rw www.xxx.it
Start: 2024-04-24T16:35:02+0200
HOST: xxxx.blogo                                    Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- static.1.202.108.65.clients.your-server.de     0.0%    10    0.6   0.4   0.3   0.6   0.1
  2.|-- core31.hel1.hetzner.com                        0.0%    10    0.3   0.3   0.2   0.4   0.1
  3.|-- juniper4.dc1.hel1.hetzner.com                  0.0%    10   13.5   2.6   0.3  13.5   4.4
  4.|-- static.213-133-121-234.clients.your-server.de  0.0%    10    1.3   2.6   0.8  11.1   3.2
  5.|-- 104.26.1.197                                  50.0%    10  105.9 102.7  77.1 111.9  14.5

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