Reverse Path Filtering prevents certbot renewal using HTTP-1 acme-challenge

Networking
2

Found it:

sysctl net.ipv4.conf.default.rp_filter=2
sysctl net.ipv4.conf.all.rp_filter=2

As I suspected, with these two commands, let’s encrypt now works. I will report the problem to their forum and see If I can do something about it.

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