⚠️ SAFETY WARNING. Since these operations involve network configurations and system files on PC, proceed with caution. Before modifying files or router settings, it is recommended to back up your data. ReeFix provides this diagnostic report solely for educational, informational, or study purposes.
CHECK 1
- Cause Analysis (Probability: 45% - High): Corruption of the local routing file
proxy_v1.bin. The game client stores routing parameters and proxy records in this local cache. If the software closes abruptly, the records fragment, forcing the client to attempt connection to obsolete endpoints and generating the handshake timeout (DELTA-01).
- Experience Signal: This error systematically occurs on PC at every startup and often happens when forcing the game to close with Alt+F4 or in the event of a sudden crash during the loading screen.
- Corrective Action (DIY - Cost: €0): Navigate to the
Documents\My Games\XDefiant directory on your PC. Locate the file proxy_v1.bin and delete it. Upon the next startup, the executable will regenerate a clean routing table.
| Recovery Option | Root Cause | Difficulty | Cost | Main Corrective Action |
| :--- | :--- | :--- | :--- | :--- |
| Check 1: Local Cache | Corruption of the proxy_v1.bin file | Easy | €0 | Delete the proxy file in the Documents folder |
| Check 2: DNS Resolution | Obsolete records or high ISP latency | Easy | €0 | Run flushdns and set Cloudflare/Google DNS |
| Check 3: NAT Configuration | UDP/TCP ports blocked by Firewall/Router | Medium | €0 | Enable UPnP or configure Port Forwarding |
CHECK 2
- Cause Analysis (Probability: 30% - Medium): DNS conflict or failure to update cache records by the internet service provider (ISP). Ubisoft authentication servers use dynamic cloud infrastructures; if local DNS servers do not resolve SRV records quickly, the connection times out.
- Corrective Action (DIY - Cost: €0): Open the command prompt as administrator and run the command
ipconfig /flushdns to clear the local DNS cache. Next, manually set the network adapter's DNS to low-latency public values (e.g., Cloudflare 1.1.1.1 as primary and Google 8.8.8.8 as secondary).
- Physical Check: If you experience micro-disconnections, replace Wi-Fi with a stable wired connection using a Ugreen Cat 8 Ethernet Cable. If you are using a laptop without a LAN port, test stability with an Anker USB C Ethernet Adapter.
CHECK 3
- Cause Analysis (Probability: 15% - Medium-Low): System Firewall restrictions or Strict NAT on the home router. If the UDP ports required for XDefiant's bidirectional data flow are blocked by the gateway, game packets are discarded.
- Corrective Action (DIY - Cost: €0): Access your router's control panel and enable the UPnP (Universal Plug and Play) feature. If the problem persists, configure manual Port Forwarding by opening TCP ports (80, 443, 13000, 14000) and UDP ports (3074, 6115) to your PC's static IP.
- Hardware Note: If the router in use is obsolete and does not properly manage priority traffic (QoS), consider upgrading to a high-performance device like the ASUS RT-AX82U Gaming Router.
If you already own this model and still experience micro-disconnections or packet loss on Wi-Fi, try disabling the Smart Connect feature in the Asuswrt wireless settings. Often, the automatic transition between the 2.4GHz and 5GHz bands causes brief timeouts that interrupt the gaming session.
CONCLUSION
The diagnostic report indicates that the DELTA-01 error is caused in 75% of cases by local software anomalies (proxy cache or DNS) that can be resolved independently at zero cost.
- Self-Resolution (Recommended): Delete the
proxy_v1.bin file (Check 1) and flush the DNS (Check 2). Time required: 5 minutes. Cost: €0.
- Technical Intervention (In case of failure): If the error persists after configuring the router (Check 3), there may be a routing issue with the provider or MTU packet fragmentation. Contact a network technician for an instrumental analysis of the line. Estimated assistance cost: €30–€60.
Handoff for the technician: "The XDefiant client generates the DELTA-01 error. Requested check on TCP/UDP socket stability, verification of any packet loss due to MTU on the gateway, and NAT configuration to Open via port forwarding of the game ports."
If deleting the proxy_v1.bin file and changing DNS do not resolve the error -> enable UPnP on the router; if the block persists, request a line check from your technician or ISP.
Caricamento interfaccia di diagnosi...
