Thanks for the reply even though it's not related to fiddler.
I suspect it may not relate to fiddler but I don't know what to do so I post here in case someone know the issue. I try to set dns with dns changer already and try it all on source mobile (hotspot's source) so that it'll not interfered by other problems
from ipconfig -all my computer ip is 192.168.43.112 and dns server 192.168.43.1
So I set both DNS to 192.168.43.1 it still cant reach http://mycomname:8888 in mobile browser(Samsung's/Chrome)
but it can reach http://192.168.43.112:8888
DNS setting works well because if I change it wrong I cant access website
^Just to point out that I've tried many ways but it won't work. It seem no hope about this. I changed almost all my 52 VMs' Proxy hostname though so it's good but that's the reason I ask for help so much task to work with it would be better if hostname work :D
Very curious why it's all worked with Samsung S4 hotspot/Another PC with Lanbut not S9 hotspot with the same VM.