Cannot connect to online repository(s)

I’m running FreePBX (SNG7-PBX-64bit-1910). I would like to upgrade modules, but when i check online in modules updates, i got this :

I tried to upgrade modules in another my Freepbx server (FreePBX, and i got same issue. And my machine cannot connect to repo
Could not resolve host:; Unknown error

Any suggestions on how to troubleshoot this?

Your PBX can’t reach the DNS server.

Thanks for replied.
I don’t know why, i have two server with different network and got same issue.
but today i tried again to check online modules in both server, and it’s work now.

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