NodeGuide / Optional reference / Networking & Ports
Networking & Ports Reference Guide
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Quick definitions appear when you tap technical terms during setup. This optional guide gives you more help with setup, settings, and troubleshooting.
Safety wording reviewed September 23, 2026. Reference instructions may differ by device, app and installed software version; NodeGuide does not detect your version. Check the current official instructions before making a change.
Before changing network or policy settings, record the current values and check your installed version’s official guide. A wrong change can block access or transaction relay. Never put RPC or an admin dashboard on the public internet.
Incoming vs outgoing node connections
Your node can connect to other Bitcoin nodes, and other nodes can sometimes connect to yours. Your node can still work even if only outgoing connections are available.
Bitcoin P2P port 8333
Bitcoin nodes commonly use port 8333 to talk to each other on the main Bitcoin network. Your node software may use a different port, so check its settings before changing anything.
Port forwarding basics
Port forwarding can let other Bitcoin nodes connect directly to your node. Most beginners do not need to change this setting for their node to work.
Firewall and router basics
Your router and firewall help control which internet connections are allowed. Only open a port if your node actually needs it.
Ways your node can connect to other Bitcoin nodes
Clearnet, Tor, and I2P are different ways your node can connect to other Bitcoin nodes. Which choices are available depends on your node software.
RPC ports are different from P2P ports
P2P is used for communication between Bitcoin nodes. RPC is used by trusted apps that connect to your node. RPC should not be exposed to the public internet.
Why RPC should stay private
RPC can reveal information about your node and may allow trusted apps to send commands. Keep it private and protect its login information.
Checking whether your node is reachable
First confirm that your node is connected to other Bitcoin nodes. If you intentionally turned on incoming connections, you can then check whether the port is reachable from the internet.
Common networking troubleshooting
If connections are not working, first check Wi-Fi or Ethernet, your node’s local network address, router or firewall settings, and the port shown by your node software. Change one setting at a time.