Enable "VPN over HTTPS" or "VPN over ICMP/DNS" in the advanced settings of your SoftEther client. These protocols are harder for firewalls to detect. Conclusion
SoftEther VPN Server can't connect during set up. - Ask Ubuntu softether vpn client error code 1 free
Here are some free solutions to help you resolve error code 1: Enable "VPN over HTTPS" or "VPN over ICMP/DNS"
Before reconfiguring anything, perform these quick checks: perform these quick checks: