Troubleshooting: FXServer is not responding! (How to fix)

When your FXServer shows “not responding” errors, you’re typically dealing with one of five core issues. This guide provides systematic troubleshooting steps for FiveM server administrators experiencing connectivity failures between txAdmin and FXServer.

Primary Cause: Port Configuration Mismatch

Issue: txAdmin cannot connect to FXServer due to incorrect port configuration in server.cfg

Fix: Verify your server.cfg contains matching TCP/UDP endpoints:

endpoint_add_tcp "0.0.0.0:30120"
endpoint_add_udp "0.0.0.0:30121"

Replace port numbers with your allocated ports. If port numbers don’t match your primary allocation port, connection errors occur.

Validation steps:

1. Check txAdmin Settings → FXServer for configured ports
2. Compare with server.cfg endpoint declarations
3. Restart server via console after corrections

Secondary Cause: txAdmin Monitor Connectivity

Issue: txAdmin:Monitor cannot connect to FXServer, causing “FXServer is not responding!” messages

Root causes:

• FXServer not responding to TCP endpoint (resource stuck)
• FXServer and txAdmin sharing same TCP port
• FXServer not listening to local interface

Fix: Launch FXServer in monitor mode:

# Windows
./FXServer.exe

# Linux  
./run.sh

Critical: Do not use +exec arguments when launching txAdmin. txAdmin requires FXServer to run in monitor mode.

Antivirus Interference (Windows)

Issue: Microsoft Defender Antivirus scanning FXServer directory causes slow startups and connectivity timeouts

Fix: Add FXServer directory to exclusion list:

# Run as Administrator
Add-MpPreference -ExclusionPath "C:\FXServer\"

Replace path with your actual FXServer directory location.

Network Configuration Issues

Issue: NAT/gateway masking UDP source ports or improper port forwarding

Fix checklist:

1. Forward TCP and UDP ports in router/firewall
2. Verify Windows Firewall allows FXServer.exe
3. Check NAT configuration for UDP port preservation
4. Test local connectivity: telnet localhost 30120

Resource Blocking Startup

Issue: Stuck resources prevent FXServer from responding to health checks

Diagnostic approach:

1. Start server with minimal resources
2. Add resources incrementally to identify culprit
3. Check console for resource error messages
4. Remove or fix problematic resources

Server.cfg testing configuration:

# Minimal startup for testing
ensure mapmanager
ensure chat
ensure spawnmanager
# Add other resources one by one

Advanced Troubleshooting

Health check failures: Monitor shows “HealthCheck request error: connect ECONNREFUSED” indicating complete connectivity loss.

Verification steps:

1. Confirm FXServer process running: tasklist | findstr FXServer
2. Check port binding: netstat -an | findstr :30120
3. Review txAdmin logs for specific error patterns
4. Test with fresh server.cfg using default FiveM configuration

Uncertainty note: Some connectivity issues may stem from hosting provider network configurations or regional firewall policies that aren’t immediately apparent from server logs.

Configuration Validation

Required server.cfg elements:

# Essential for server listing
sets sv_projectName "Your Server Name"
sets sv_projectDesc "Your Server Description"

# Correct endpoint configuration
endpoint_add_tcp "0.0.0.0:30120"
endpoint_add_udp "0.0.0.0:30121"

# Enable txAdmin integration  
start txAdmin

Servers display errors if sv_projectName and sv_projectDesc aren’t set.

Resolution Priority

1. First: Verify port configuration in server.cfg
2. Second: Launch FXServer without +exec arguments
3. Third: Add antivirus exclusions
4. Fourth: Check network/firewall settings
5. Fifth: Isolate problematic resources

Most “FXServer is not responding” errors resolve through correcting port mismatches between server.cfg endpoints and txAdmin configuration, followed by ensuring proper monitor mode startup procedures.