CellsSync only add folder but no file uploaded

Server (empty)
OS: win10
Pydio: 3.0.1
IP Port: 192.168.1.121:8080
Exteral Port: XXXdomain: 33333
Sync Folder: Keep data structure

Client (files)
OS: win7
CellsSync: 0.9.2
IP: 192.168.1.120

Hosts setup on both side: 192.168.1.121 www.bbb.com
(file: C:\Windows\System32\drivers\etc\hosts )

  1. Actually server & client in the same network, I can run sync perfectly via Exteral Domain/Port.

  2. But when I do the sync directly within local network (via www.bbb.com), only folder added to server, no file uploaded.

  3. And if I login via server ip: 192.168.1.121, I got “cannot connect to discovery endpoint: Get https://192.168.1.121:8080/a/config/discovery: x509: certificate is valid for 127.0.0.1, ::1, 192.168.1.121, not 192.168.1.121” when I select server path during task creating.

Certificate Info ( certificate key installed on both pc, browser shows correct https site )
image

Now, 3 ways: external domain name, local domain name, local ip.
only the first one works properly.

I think sync within local network means faster, so what I did wrong or something more I need to do ?