Are you using the , or connecting to a private custom server ?
Right-click your connection entry, choose Properties , and click Advanced Settings . Ensure UDP Acceleration is enabled. If it is already on, try turning it off; some highly restrictive networks block UDP traffic entirely, forcing you to rely solely on TCP. 6. Restart the SoftEther Background Service
When the SoftEther VPN Client attempts to connect to a VPN Server and fails, it generates a specific error code to diagnose the breakdown. Error Code 1 is officially defined by the software as:
If you have access to the server, guesswork is not required. SoftEther logs will tell you exactly why the client is being rejected. Open the . Navigate to Manage Server -> View Server Log . softether vpn client error code 1 free
Note: Ensure you are not forwarding one port to multiple internal IP addresses. . 2. Check "Nobody Listens" Scenario
The SoftEther VPN Client creates a virtual network adapter on your PC. If this adapter is disabled, uninstalled, or corrupted, Error Code 1 appears instantly. Re-registering it costs nothing and solves 70% of cases.
"Error: VPN connection failed. Error code: 1" Are you using the , or connecting to a private custom server
Start with and Fix #3 (Reset Winsock) . These two free commands solve more than 80% of cases. If you are still stuck, remember that a complete purge and reinstall using free tools takes less than 10 minutes and will restore full functionality.
The specific TCP/UDP port you selected is blocked by network administrators.
Check both the and Public boxes for these applications. Click OK to save changes. 5. Change the Tunneling Protocol / Port If it is already on, try turning it
: ISP-level filtering or "Double NAT" (having two routers in a row) can prevent inbound connections from reaching the server. Service Inactivity
A: This message appears when a non-SoftEther VPN client (like an OpenVPN client) connects to a port that expects the native SoftEther protocol. It can also be triggered by a transparent proxy or DPI firewall on your network that is inspecting the VPN traffic.
Simply put, error code 1 is a . It means your SoftEther VPN Client sent a request to the server's IP address and port number, but it never received a reply. This can happen for many reasons, but they all fall into three main categories:
: If the server is behind a router (NAT), it requires manual 1:1 port forwarding (commonly for ports 443, 992, 1194, or 5555). Double NAT
Error code 1 in SoftEther VPN Client (free version) is a . It typically means the VPN client service or adapter failed to start properly. The error message often appears when you try to connect or launch the client.