Hi @mgr
Personally, I haven’t run into this issue. If you have a cmk-agent-ctl-daemon though, can it be, that you’re using the 2.1 beta, which seems to require TLS for some things? There was someone with a similar problem, who needed to touch a file to get the socket to “exist”. Please see this comment: Agent lauscht nicht an Port 6556 systemd - #9 by gulaschcowboy
The post is in German, but the relevant part - if I understood correctly - was to touch /var/lib/cmk-agent/allow-legacy-pull if one isn’t using, or doesn’t want to use TLS.
HTH,
Thomas