AkaneKutinashi
Summary
Since around February 28, 2026, connecting through Cloudflare WARP (VPN mode) prevents logging in or properly using VRChat across all platforms — the website, Unity SDK, and the VRChat client app.
This is problem, because
VRChat's own help pages explicitly state that Cloudflare WARP is allowed:
> "As a last resort for connection issues, try using a VPN.
Cloudflare's WARP is allowed
, but some other VPNs may be blocked." — VRChat keeps crashing or has issues launching properly
> "Try using Cloudflare's WARP tool"— Troubleshooting Connection Issues with VRChat
Symptoms (all with WARP enabled)
1. VRChat Website (vrchat.com)
  • Login appears to succeed momentarily, then immediately redirects back to the login page.
  • This loops indefinitely. (recording attatched to this post)
2. VRChat SDK (Unity Editor)
  • Login fails with the following errors: (screenshot attatched to this post)
-
Unauthorized, try logging out and in again
-
"Missing Credentials"
-
NullReferenceException
at
VRCSdkControlPanelAvatarBuilder.cs:1491
  • Stack trace points to
    VRCApi.cs:288
    in
    MakeRequestWithResponse
3. VRChat Client App (PC)
  • Login itself succeeds.
  • Immediately placed in the Error World.
  • Cannot navigate to any other world — always sent back to Error World.
  • VRChat is effectively unusable.
All three services work normally when WARP is disabled.
WARP was working fine with VRChat until approximately February 26, 2026. This timing coincides with the API and Social/Friends List maintenance on Feb 26–27 (per https://status.vrchat.com).
Why This Matters: Many Users Need WARP
Many users, including myself, rely on Cloudflare WARP because
without it, VRChat times out when loading other players' avatars
, making multiplayer sessions impossible. The symptoms without WARP:
  • Avatar loading for other players stalls completely → other players' movement/voice freezes → timeout → "VRChat is not responding"
  • Occurs reliably with 10+ players in an instance; does not occur when alone
  • Own avatar loading and world loading are unaffected
  • This is a well-documented, long-standing issue reported by many users (see Related Reports below)
The current situation means VRChat is completely unusable either way:
  • WARP off → avatar loading timeouts in any populated instance
  • WARP on → cannot log in / stuck in Error World
Environment
  • OS: Windows 11 Home
  • CPU: 13th Gen Intel Core i7-13700F
  • GPU: NVIDIA GeForce RTX 4070
  • RAM: 32GB
  • ISP: Katch Network (Japan)
  • Connection: Wi-Fi
  • VRChat Build: Build ID 22116304
  • VRChat SDK: 3.10.0
  • Unity: 2022.3.6f1
  • Cloudflare WARP: 2026.1.150.0 (VPN mode)
Attachments
  • Video: Website login loop (to be attached)
  • Screenshot: Unity SDK "Missing Credentials" error (to be attached)
Related Reports
WARP/VPN connection issues (same or similar problem):
Avatar loading timeout (the reason WARP is needed):
Update: Output log analysis
I compared output_log.txt captured with WARP ON vs WARP OFF. With WARP ON, every API call after login is rejected with 401 "Missing Credentials". The log reveals the reason: "authToken doesn't correspond with an active session" — and the source IP address (Cloudflare WARP IPv6) changes between requests. This may mean VRChat's API is binding sessions to IP addresses, but WARP rotates its exit IP on every request, so the server treats each subsequent call as an invalid session.
This session-IP validation likely became stricter with the Feb 26–27 maintenance, as the same setup worked fine before that date.
I have submitted a support request with full output log and details on VRChat Help Desk.
250228-bugreport-1

250228-bugreport-1