maybe it is a silly question, but I found no solution on my own ;-(
I transferred the backup from
https://www.musikserver.news to
https://www.dacc.news
that was really easy and everything works fine.
But when I click on the menu item which is marked a start item ("Aktuelle Beiträge") both urls are added to the address datafield of the browser:
https://www.dacc.news/https:/www.musikserver.news
All other urls are ok. I checked the configuration.php file and the variables are correct:
$fromname = 'www.dacc.news';
$live_site = 'https://www.dacc.news';
$sitename = 'www.dacc.news';
I searched for the string "www.musikserver.news" in .htaccess and configuration.php, but did not found it.
I have really no idea where the url https://www.dacc.news/https:/www.musikserver.news comes from.
Hoping someone has a hint for me even if the mistake has nothing to do with akeeba but something to do with joomla itself.
All the best
Markus