Reactivate AFP von Mac High Sierra OS X Server (10.13)

I am having trouble with my High Sierra OS X Server's file sharing volumes. Sometimes the connection is very slow. Other times I can't connect. Then I sometimes have multiple mounted volumes of the same share, but I can't write to any of them. I don't have any hard drives converted to APFS, so my question was, is there a way to activate AFP from Terminal? sudo serveradmin fullstatus afp shows that there is something still there and I can start the afp demon without any error message with serveradmin start afp. My only question is where do I configure the settings? Thanks for any suggestions. ;-)