Status:
Available
GRMON and TSIM are licensed using a Sentinel LDK USB hardware key.
Understanding and Fixing Parsec Error 6023 (Unable to Negotiate Connection)
You must approve Parsec in Privacy & Security > Local Network to allow it to talk to other devices. 3. Enable UPnP or Port Forwarding
If your ISP uses CG-NAT, standard port forwarding might not work. In these cases, using a P2P-friendly VPN like or Tailscale can create a virtual "local" network between your devices, effectively bypassing the ISP's blocks.
Check your router’s settings and ensure UPnP is enabled. This allows Parsec to request the ports it needs on the fly.
Forward ports 8000–8002 UDP to the IP address of your host computer. You can find detailed steps on the Parsec Port Forwarding Guide . 4. Bypass Restrictive ISPs with a VPN
Ensure your network is set to Private rather than Public. Public networks often have built-in firewalls that block P2P connections. 2. Configure Your Firewall
Several underlying network issues typically trigger this error:
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