Internet router DMZ configuration failing
4.5
DMZ is enabled, but the designated device is still being blocked.
Symptoms
- Ports still closed on DMZ device
- No internet on DMZ device
- Router logs show blocks
Possible Causes
- Double NAT
- Device firewall active
- Incorrect DMZ IP
Step-by-Step Fix
1
Check for Double NAT
Ensure your modem isn't also acting as a router.
2
Disable Device Firewall
Windows Firewall or Mac Firewall may still be blocking traffic.
3
Verify IP Address
Ensure the device hasn't changed its IP since you set up DMZ.
When to See a Technician
If DMZ fails, try manual port forwarding instead; it is safer and often more reliable.
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