Perhaps a DNS or ISP issue? Ever thought about changing your DNS? Consider changing it and retry.

Hello,

Check if ports 17000-18000 are open on your PC. And VPN is not blocked in your country.

Hello! I've opened those ports and I can use other VPNs in my country. As well some friends use it regularly.
In Advanced Port Scanner I can't see those opened ports, and I don't know why, as I've tried with Andivirus disabled, router with opened ports, Windows Firewall with opened ports.
Thank you.

Hello,

You can also try this:
stop the radmin vpn service
Control Panel \ All Control Panel Items \ Administrative Tools \ Service
find radmin right-click and select stop.
Run the cmd as administrator and enter
ipconfig / flushdns
Start the radmin vpn service
Control Panel \ All Control Panel Items \ Administrative Tools \ Service
find radmin right-click and select start.

I'll try that tonight.
But please tell me this: Should I only open single 17000 and single 18000 in both TCP and UDP, or all the range between 17000-18000??
For now I've done this: Opened singular ports 17000 and port 18000 for both TCP and UDB in Windows 10. Disabled 3rd party Antivirus/Firewall. Opened same ports in Router as well. And still nothing.
Thanks.

Hello,

Yes, you need to open a range of ports from 17000 to 18000.

I was opening only single ports 17000 and 18000.
Is this why I'm able to connect if I run Radmin on my pc behind a VPN?
Behind a VPN I get no issues in connecting...
Thanks!!