Hi ChristianM,
thanks for your kind reply.
I understand that there is a ‘suid’ problem , B U T
this is a pure DOCKER IMANGE directly from CheckMK - so if there is a problem with this and all the last DOCKER IMAGES, who can I ask to investigate and find a solution?
because I have no idea where to search and find ‘ping’ or ‘check_icmp’ to whatever the reason is, and because I am not sure whether this is a bug or a wanted behavior, I intend to ask the checkMK community (with hope that a checkMK related person might also read it 
).
best regards
Mike
what could be the temp. fix?