Erro gradel to build apk file

i use this comment to create apk file (ionic cordova run android)

*** What went wrong:**
A problem occurred configuring root project ‘android’.
> Could not resolve all dependencies for configuration ‘:classpath’.
** > Could not resolve**
** Required by:**
** project :**
** > Could not resolve**
** > Could not get resource ‘’.**
** > Could not HEAD ‘’.**
** > Connect to [] failed: Connection timed out: connect**
** > Could not resolve**
** > Could not parse POM**
** > Already seen doctype.**

*** Try:**
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

What happens if you manually open in your browser? Does it download a file?

What is your ionic info output?

not download gradle file

my ionic info
@ionic/app-scripts : 3.1.5
Ionic Framework : ionic-angular 3.9.2


Node : v8.9.3
npm  : 5.5.1 
OS   : Windows 10


backend : pro

Excuse me, but: What?

not download gradle file

What does it do instead?

my problem resolve by vpn
not access gradle file in iran