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Firewall is blocking node traffic

If your node receives connection attempts but sessions fail, your firewall may be blocking required traffic.

Written by Andzej Korkuz

Check firewall rules

Run

# iptables -L -n 
# iptables -L -n -t nat

Look for:

  1. Blocked or restricted UDP traffic

  2. Forwarding rules set to DROP

Allow forwarding

sudo iptables -P FORWARD ACCEPT

Test without firewall (temporary)

To confirm if the firewall is the issue:

sudo iptables -F
sudo iptables -t nat -F

After testing

  1. Restart your node

  2. Run a connection test

  3. If it works, configure proper firewall rules instead of leaving it disabled

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