rspamd throwing a lot of "no route to host" errors

Hey there,
I’m Running Mailcow-Dockerized on Debian 10 behind a traefik reverse proxy.
rspamd is showing a lot of “no route to host” errors for example:

rspamd-mailcow_1     | 2022-10-03 19:30:12 #40(normal) <1d6rk4>; lua; neural.lua:780: cannot get ANNs list from redis: No route to host
rspamd-mailcow_1     | 2022-10-03 19:30:12 #39(controller) rspamd_redis_stat_keys: cannot get keys to gather stat: No route to host
rspamd-mailcow_1     | 2022-10-03 19:30:12 #39(controller) <1d6rk4>; lua; neural.lua:780: cannot get ANNs list from redis: No route to host
rspamd-mailcow_1     | 2022-10-03 19:30:12 #39(controller) <1d6rk4>; lua; neural.lua:780: cannot get ANNs list from redis: No route to host
rspamd-mailcow_1     | 2022-10-03 19:30:19 #37(fuzzy) <u33g77>; fuzzy_redis; rspamd_fuzzy_redis_count_callback: error getting count on [fd4d:6169:6c63:6f77::3]:6379: No route to host
rspamd-mailcow_1     | 2022-10-03 19:30:22 #40(normal) rspamd_redis_stat_keys: cannot get keys to gather stat: No route to host
rspamd-mailcow_1     | 2022-10-03 19:30:46 #39(controller) rspamd_redis_stat_keys: cannot get keys to gather stat: No route to host
rspamd-mailcow_1     | 2022-10-03 19:31:12 #40(normal) rspamd_redis_stat_keys: cannot get keys to gather stat: No route to host
rspamd-mailcow_1     | 2022-10-03 19:31:12 #40(normal) <1d6rk4>; lua; neural.lua:780: cannot get ANNs list from redis: No route to host
rspamd-mailcow_1     | 2022-10-03 19:31:12 #39(controller) <1d6rk4>; lua; neural.lua:780: cannot get ANNs list from redis: No route to host
rspamd-mailcow_1     | 2022-10-03 19:31:12 #39(controller) <1d6rk4>; lua; neural.lua:816: cannot exec invalidate script in redis: No route to host
rspamd-mailcow_1     | 2022-10-03 19:31:22 #37(fuzzy) <u33g77>; fuzzy_redis; rspamd_fuzzy_redis_count_callback: error getting count on [fd4d:6169:6c63:6f77::3]:6379: No route to host
rspamd-mailcow_1     | 2022-10-03 19:31:28 #39(controller) lua; ratelimit.lua:595: cannot check limit 1000:null@localhost: No route to host nil

This is my mailcow.conf: mailcow.conf - Pastebin.com

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mailcow.conf - Pastebin.com

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docker-compose.yml - Pastebin.com

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docker-compose.yml - Pastebin.com

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docker-compose.override.yml - Pastebin.com

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docker-compose.override.yml - Pastebin.com

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I know that redis works since redis-cli MONITOR shows activity

rspamd seems to work, but I can’t see any history in the web UI. It shows “local > Cannot receive history: Gateway Timeout”

Does anyone have any idea what’wrong?