Domain mapping issue after moving multisite to new server

Hi there!
I finally dared to move my site to an new webhost, with Linux hosting. All went fine, as far as I can see now, except that all my subdomains (made with aliasses in Plesk, as my host instructed me) are led back to the main site, despite my settings in the domain mapping plugin.
I could use some assistence here...
Thanks in advance!!