Failed to create virtual server : Failed to work out externally visible IP address

OK, i managed to find the issue

Virtualmin -> System Settings -> Virtualmin Configuration -> Network Settings
changed from :
“Network interface for virtual addresses” eth0

to

“Network interface for virtual addresses” Detect automatically

Now the issue is gone. I can create new virtualmin servers.

I have only one IF (eth0) and /etc/sysconfig/network-scripts/ifcfg-eth0 hadn’t changed so I have no clue what causes this behaviour anyway.

BUT!:Now I have a yellow virtualmin message
“Virtualmin’s configuration has not been checked since it was last updated. Click the button below to verify it now.” and when I click Recheck it switches “Network interface for virtual addresses” option back to eth0 which spoils the coffee over again.

What helps is an IP entry in ->
“Default virtual server IP address” 192.168.1.11 in my case. Previously this option was set to “From network interface”.

That’s weird because all my /etc/httpd/conf/httpd.conf per vhost entries always got
< VirtualHost *:80 > and putting that IP does not have any impact on this.

Anyway.
Eveything looks & works fine.
Have no idea what cause that mess.