External Files - Changes lead to Shares being deleted


we have recently changed our fileserver and I’m trying to point to the new SMB shares.
I’m going from x.x.x.11 to x.x.x.2 with a change of the shared folder name and the users domain, keeping username and password.
As soon as I change the properties of the external storage, all the Shares are gone.
I also tried to stop apache2 and change the values directly in mysql, but the result is the same.

Anybody made this experience and has a solution for this?

Best regards