I figured out what the problem was with the item generator and building seeder. The url was changed. Type these in instead.
Item generator:
http://dukesrg.dynu.net/3ds/rop/?LoadCode.dat<-itemgen.bin
Building seeder:
http://dukesrg.dynu.net/3ds/rop/?LoadCode.dat<-seed.bin
I had the same problem with the building seeder even with all the required files on my sd card. I even tried deleting the files I had and uploading the ones from here onto the root of my sd card and I still got the connection error. What file specifically got yours to work? I took everything...