I have the same error code for several days.
And I have tried the troubleshooting processes as below and still failed:
1. Disable security software
2. Bypass your router and try connecting directly to your modem
3. Ensure ports 80, 443, 6112 and port 6600 are fully unrestricted and accessible, both inbound and outbound.
4. DNS Flush
5. Winsock Reset
6. Msconfig