I have the same problem on Linux Debian 11. I use NFTables, Firewalld + Crowdsec, Crowdsec-firewall-bouncer-nftables. Packages of latest (current) versions installed by standard instruction - repository packagecloud.io.
Every 10 seconds I get the following entries in crowdsec_api.log:
time=“23-01-2022 21:38:33” level=info msg="127.0.0.1 - [Sun, 23 Jan 2022 21:38:33 +05] "GET /v1/decisions/stream?startup=false HTTP/1.1 200 3.299679ms “crowdsec-firewall-bouncer/v0.0.21-debian-pragmatic-<…>” “”
time=“23-01-2022 21:38:43” level=info msg="127.0.0.1 - [Sun, 23 Jan 2022 21:38:43 +05] "GET /v1/decisions/stream?startup=false HTTP/1.1 200 4.134547ms “crowdsec-firewall-bouncer/v0.0.21-debian-pragmatic-<…>” “”
time=“23-01-2022 21:38:53” level=info msg="127.0.0.1 - [Sun, 23 Jan 2022 21:38:53 +05] "GET /v1/decisions/stream?startup=false HTTP/1.1 200 3.120844ms “crowdsec-firewall-bouncer/v0.0.21-debian-pragmatic-<…>” “”
time=“23-01-2022 21:39:03” level=info msg="127.0.0.1 - [Sun, 23 Jan 2022 21:39:03 +05] "GET /v1/decisions/stream?startup=false HTTP/1.1 200 3.88449ms “crowdsec-firewall-bouncer/v0.0.21-debian-pragmatic-<…>” “”
time=“23-01-2022 21:39:13” level=info msg="127.0.0.1 - [Sun, 23 Jan 2022 21:39:13 +05] "GET /v1/decisions/stream?startup=false HTTP/1.1 200 3.250693ms “crowdsec-firewall-bouncer/v0.0.21-debian-pragmatic-<…>” “”
What do I need to do to fix this?