Dynamics NAV App on android error "Server connection timeout occurred"

Hi All,

I'm using android phone to connect Dynamics NAV

I follow step as below :

1.Installed Navision 2016 on Server

2.Created the selfsigned certificate in server.

3.Installed certificate in my phone.

But i can't connect to server.

I get message "Server connection time out occurred" but i try to connect by iPhone or windows app on windows10 is working perfectly.

Any help would be appreciated.

Thanks in advance.