If I change the active image back to the old firmware image (administration -> file management -> active image ... that feature on these switches is actually nice), it is working again to access the webconfig by using the hostname. So I think it must...

Hello,I do have the same problem.Owning a SG300-28P and a SF302-08P, and updated both to version 1.4.11.2.Webconfig loads in browser only if accessed by IP, not by hostname.