I cannot connect to my portal gis on my LG Android phone using arcgis collector ( it worked on IPhone and IPad ). Error "Could not find https: https://vtg-gis-07.hcmpc.com.vn/arcgis Please check the URL and try again". Thank you.
Make sure your phone can access the portal. Try accessing the portal from a web browser on your device and see if it can access the portal there. If it cannot then you will have to check what network your LG phone is on.
I assume your Portal is in internal network. Make sure your device can access it via VPN or internal wi-fi network. .etc. Also, it is always good to check if Portal is up.
When using laptop to connect by VPN ( using Junos Pulse ) i can connect to arcgis portal. On my Android device i can connect to a server in internal network but cannot connect to arcgis portal. Error show on Android device "DNS can not find URL".