: Verify your network is set to Private rather than Public. Public profiles often block P2P traffic by default. 2. Router & Network Settings
Also known as the (a term users have coined because this error can feel uniquely persistent and isolated), this code stops Parsec from establishing a peer‑to‑peer connection between your client and host machines, abruptly ending your remote session before it even starts.
Complete Guide to Resolving the and Connection Blockers
: Security software often views P2P traffic as a threat rather than a tool. 6023 parsec error exclusive
The "exclusive" part of the error violates the Copernican principle—the idea that there are no privileged observers in the universe. Here, the phenomenon clearly selects one observer (or one ship) over all others. This has led to three major schools of thought:
The core issue behind Error 6023 is or Symmetrical NAT . Parsec relies on UDP hole punching to establish a direct connection between the host and the client. If either party has a "Strict" or "Symmetric" NAT configuration (often determined by the router), the handshake packets are dropped, resulting in error 6023.
Plug the host computer directly into the primary gateway (the device connected to the wall outlet) via Ethernet. : Verify your network is set to Private rather than Public
Your router might have "Strict NAT," preventing peer-to-peer connections.
| Secondary Code | What It Means | What to Do | |----------------|---------------------------------------------------------------------|----------------------------------------------------------------------------| | -11000 | UPnP is disabled or not supported by the router. | Enable UPnP or fall back to manual port forwarding. | | -11010 | UPnP is disabled in Parsec’s own settings. | Open Parsec settings → check “Enable UPnP.” | | -11011 | Guest Wi‑Fi network blocking UPnP. | Switch to a private network or use Tailscale/ZeroTier. | | -11012 | Carrier‑grade NAT (CGNAT) detected. | Request a public IPv4 from your ISP, or use Tailscale. | | -11013 | Double NAT detected. | Place your ISP modem in bridge mode or port‑forward twice. |
Many ISPs utilize to conserve IPv4 addresses. Under CGNAT, multiple households share a single public WAN IP, making direct inbound P2P connections impossible and triggering error 6023. How to Test for CGNAT on Windows Press Windows Key + R , type cmd , and press Enter . Run the traceroute command to a public DNS destination: tracert 1.1.1.1 Use code with caution. Look closely at the second hop in the output list. Router & Network Settings Also known as the
Parsec must be explicitly allowed through your system's firewall on both machines.
Unlocking Remote Gaming: The Ultimate Guide to Fixing the Parsec 6023 Error (Exclusive Solutions)