In most cases, this error happens with your firewall. Please check follows in your PC and server with your IT manager.
1. If your company is using Proxy server, please set proxy in Netpas software.
Tools --> Options --> Network
2. If your company is using Firewall, please allow our IP.
Netpas server domain : dist.netpas.net
220.127.116.11 : 80
18.104.22.168 : 80 and 443
3. Personal firewall or security software in your PC can block “distance.exe”. Please check it in your PC.
4. Try to connect to access www.netpas.net in web browser. If you cannot see this page, your ISP may be blocking it.