Filecatalyst Errors _best_ Jun 2026

Comprehensive Guide to Troubleshooting FileCatalyst Errors FileCatalyst is an accelerated file transfer solution designed to overcome the limitations of TCP-based transfers (like FTP). However, because it operates at the kernel level to bypass TCP overhead and utilizes a complex architecture of clients, servers, and agents, errors can arise from network configurations, permission issues, or software mismatches. This guide categorizes common FileCatalyst errors, their root causes, and resolution strategies.

1. Connectivity and Network Errors These are the most common errors, typically occurring during the initial handshake or mid-transfer. Error: "Connection Refused" or "Timeout" Symptoms: The client cannot reach the FileCatalyst Server or Webmail interface. Root Causes:

Firewall Block: The specific port (default is 8123 for control, others for data) is blocked by a corporate firewall or AWS Security Group. Service Down: The FileCatalyst Server service is not running. IP Binding: The server is configured to bind to a specific IP that has changed or is inactive.

Resolution:

Verify the server service status (Windows Services or Linux daemon). Use telnet [server_ip] [port] to test connectivity. Check the fc_server.conf file to ensure the Listen Address is correct (0.0.0.0 for all interfaces).

Error: "UDP Hole Punching Failed" Symptoms: Transfers default to TCP (slow) or fail entirely when trying to establish a direct UDP stream. Root Causes:

Symmetric NAT: FileCatalyst uses UDP for acceleration. If one side is behind a Symmetric NAT, the UDP "hole punch" technique often fails because the port mapping changes for every connection. Blocked UDP Ports: The range of UDP ports configured on the server is not open on the firewall. filecatalyst errors

Resolution:

Enable UDP Proxy or TCP Fallback in the client connection settings. If you control the network, configure the firewall to preserve the source port (Full Cone NAT is ideal). Open the specific UDP port range on the server firewall as defined in the server configuration.

2. Licensing and Activation Errors FileCatalyst requires a valid license file ( .lic ) to function. Errors here will usually prevent the server or client from starting. Error: "License Expired" or "Invalid License Key" Symptoms: Server refuses connections; Client launches in "Trial Mode" or exits immediately. Root Causes: Root Causes: Firewall Block: The specific port (default

The maintenance subscription has expired. The license file is corrupt or edited. Hardware ID Mismatch: The license is node-locked to a specific hardware ID (MAC address/CPU ID), and the server hardware was changed.

Resolution: