The answer I did receive was: It appears you are using your computer for business purposes or connecting to a business network.
And that I should have read the rules before posting.
I did read the rules before posting!
And: my PC is NOT used for business or connected to a business network.
I did retire almost 5 years ago. Our small network is a home network. And the hijacked site is a members only site of our local Lions club. It is not used to collect money but only used for communication between members.
(momentarily the site can be visited by everybody on the web, because the members only log in was arranged by a plug-in. Unfortunately the hijacker removed all plugins)