Hi @cmcannady - thanks for the welcome and for your reply.
I thought I followed the AIX installation instructions correctly, but something went wrong with producing the masthead file. With the url I got a text output, some readable header info and some encoded stuff. 18 kByte.
IBM Support showed me where the log file to look at is: /var/opt/BESClient/__BESData/__Global/Logs (didn’t find that info on the documentation) and there it was: Client shutdown (Failed loading action site masthead)
So I went back to the BigFix/ILMT server and made a file search for masthead.afxm and I found a 54 kByte file.
Uploaded it to the client, restart and … BINGO!
Thanks for your reply and have a nice day.