Error Code 1 is a generic network-level timeout. It indicates that the SoftEther VPN Client sent a connection request, but the handshake failed. The primary causes include:
Your local firewall, router, or ISP is blocking VPN protocols.
One moment you are connected and browsing securely through your VPN tunnel. The next, you are staring at a frustrating error message. You try to reconnect—nothing. You restart the client—still nothing. The same cryptic notification appears: "Error Code 1: Connection to the server failed."
When posting for help, include:
Right-click your connection setting and select Properties . Try changing the port number. Common alternatives include 443 (HTTPS), 992 , or 5555 . 4. Reinstall the Virtual Network Adapter softether vpn client error code 1 free
Look for the port setting and change it to (which mimics standard HTTPS web traffic).
Are you using the or connecting to a private/corporate server ?
The following table summarizes the primary reasons for this error and their respective fixes: Issue Type Problem Description Recommended Solution
This guide outlines exactly what causes this issue and provides step-by-step methods to resolve it for free. Understanding the Root Causes Error Code 1 is a generic network-level timeout
: Temporarily disable firewalls on both the client and server machines to see if the connection establishes. If it works, re-enable them and create an exception rule for the SoftEther VPN executable and its ports.
Which (Windows 10, Windows 11, macOS, Linux) are you running?
These protocols may traverse firewalls more successfully when the native SoftEther protocol is blocked.
SoftEther VPN client is a popular, open-source VPN client software that allows users to connect to VPN servers securely. It supports various VPN protocols, including SSL/TLS, IPsec, and L2TP/IPsec. SoftEther VPN client is widely used by individuals and organizations due to its ease of use, flexibility, and robust security features. One moment you are connected and browsing securely
If you have access to the local network where the VPN Server resides, try connecting from another device on the same subnet. This eliminates internet routing, ISP issues, and port forwarding as potential causes. If local connections work but remote ones fail, you know the problem lies in router configuration or ISP-level restrictions.
Open Windows Security > Firewall & network protection > Allow an app through firewall . Ensure both vpnclient.exe and vpnclient_x64.exe are checked for both Private and Public networks.
SoftEther VPN is a powerful, open-source, multi-protocol VPN software favored for its speed and ability to bypass restrictive firewalls. However, users frequently encounter the frustrating , which often says, "Connection to the server failed. Check network connection and make sure that address and port number of destination server are correct".
In the connection properties of SoftEther, ensure "NAT Traversal (built-in ICMP/UDP hole punching technology)" is turned on. This helps break through strict residential routers.
What (Windows, Linux, macOS) are you running? Have you recently updated your antivirus software ? I can provide more targeted steps based on your setup. Share public link