I had multisite working with several sites as subdomains. I used the domain mapping plugin to map domains to them, and realized that I forgot to change to a dedicated IP to make this work properly on my host.
Once the IP change propagated, the mapped sites work (as far as visiting them from a browser), but the multisite functionality is broken.
By "broken" I mean that I cannot get to the sites or their admin panels using the subdomains, but my main site seems to be working fine. I also cannot create new sites. (and, yes, my wildcard DNS is in place)
Thank you in advance for your help.