Fix: Escape from Tarkov “Error on POST” / “Error 0”

When launching Escape from Tarkov on PC, the game may fail to open and crash immediately with “Error on POST” or “Error 0”, stopping you from reaching the launcher login or starting the game.

In most cases, the launcher’s login/authentication request fails because Tarkov’s services are down, your ISP route is unstable, or something on your PC/network (DNS, proxy, firewall, antivirus) is interfering with the connection.

Common causes include:

• Server-side outage or overload (authentication/backend services degraded or offline).
• Network routing/ISP path issues causing login requests to time out or fail.
• Blocked/altered response (launcher expects JSON but receives HTML due to filtering or a gateway/block page).
• DNS or proxy interference (bad DNS resolution, Windows/system proxy, VPN/proxy conflicts).
• Firewall/antivirus web protection blocking or inspecting HTTPS traffic.
• Corrupted launcher cache/session state causing repeated login failures.

1. Check Server Status

If Authentication or Backend is degraded/offline, the launcher cannot complete login, so PC-side fixes will not help until services recover.

• Check the official status page here. If you see “Degraded” or “Offline,” wait and try again.

2. Sync System Time

If your Windows date/time is wrong, secure connections can fail (certificate validation), which can trigger these login errors even when browsing works.

1. Open Settings > Time & language > Date & time.
   
2. Turn on Set time automatically and Set time zone automatically.
   
3. Click Sync now.
4. Restart the Tarkov launcher and try again.

3. Disable Proxy (If Enabled) and Reboot Network

A Windows proxy (or one set by an app/office network) can route the login request through a server that blocks it or returns the wrong response.

1. Open Settings > Network & Internet > Proxy.
   
2. Turn Use a proxy server to Off (unless you intentionally need it).
   
3. Close the launcher and restart your PC.
4. Power off your router/modem for 2 to 10 minutes, power it back on, then test again.

4. Use a VPN

If servers are up but login still fails, your ISP route to Tarkov services may be unstable. A VPN can change the route and exit IP, which often restores login.

1. Install a VPN. For a quick test, you can use Cloudflare WARP.
2. Connect to a nearby region and avoid rapidly switching locations.
3. Restart the launcher and try logging in again.

Note: If a VPN fixes it, the issue is likely ISP routing or IP-based filtering. You can keep the VPN temporarily, or try DNS/IP steps below to stabilize without it.

5. Change DNS and Flush It

If your ISP DNS resolves Tarkov endpoints slowly or incorrectly, the launcher can fail during login. Switching DNS and clearing cached records can fix it.

1. Open Control Panel > Network and Internet > Network and Sharing Center.
   
2. Click Change adapter settings.
   
3. Right-click your active connection > Properties.
   
4. Select Internet Protocol Version 4 (TCP/IPv4) > Properties.
   
5. Select Use the following DNS server addresses and enter:

• 1.1.1.1 and 1.0.0.1 (Cloudflare), or
• 8.8.8.8 and 8.8.4.4 (Google)
  

6. Click OK and close all windows.
7. Open Command Prompt as Administrator and run:

   ipconfig /flushdns

   

8. Restart the launcher and test login again.

6. Manually Select a Different Server/Region (If Available)

If one region is overloaded, forcing a stable nearby region can reduce failed attempts. This option may not exist on every launcher version.

1. Open the Tarkov Launcher.
2. Go to Settings.
3. Find Server or Region (if available).
4. Turn off Auto.
5. Select only 1 to 3 nearby servers with the lowest ping.
6. Save and restart the launcher.

Tip: Do not select too many servers. More endpoints can mean more failed handshakes while the launcher cycles through them.

7. Reset Network Stack (Winsock) on Windows

After VPNs, security tools, or network driver changes, Windows networking can break in a way that affects specific apps. Resetting Winsock/IP can restore normal connections.

1. Open Command Prompt as Administrator.
2. Run these commands:

netsh winsock reset
netsh int ip reset

3. Restart your PC.
4. Open the launcher and test login again.

8. Refresh or Change Your IP

If your current IP is on a bad route or is being filtered, login may fail consistently. Getting a new IP can move you to a different path.

• Fastest check: Try a mobile hotspot. If it works, your home ISP route/IP is likely the issue.
• Quick self-try: Restart your router/modem and keep it off for 2 to 10 minutes.
• Best option: Ask your ISP for an IP change or route refresh.

If an IP change fixes it, this is almost certainly routing/filtering, not corrupted game files.

9. Allow the Launcher Through Firewall/Antivirus

Firewalls and antivirus “web protection” can block or inspect HTTPS traffic. If the launcher is blocked, or the response is modified, authentication can fail.

1. Open Windows Security > Firewall & network protection > Allow an app through firewall.
   
2. Allow Tarkov Launcher (and Battlestate/BSG entries) on Private and Public networks.
3. If you use third-party antivirus, temporarily disable Web Shield or HTTPS scanning and test login once.
4. Turn protection back on after testing.