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configure_rpc_server_listen_interfaces.md

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dcrd allows you to bind the RPC server to specific interfaces which enables you to setup configurations with varying levels of complexity. The rpclisten parameter can be specified on the command line as shown below with the -- prefix or in the configuration file without the -- prefix (as can all long command line options). The configuration file takes one entry per line.

A few things to note regarding the RPC server:

  • The RPC server will not be enabled unless the rpcuser and rpcpass options are specified.
  • When the rpcuser and rpcpass and/or rpclimituser and rpclimitpass options are specified, the RPC server will only listen on localhost IPv4 and IPv6 interfaces by default. You will need to override the RPC listen interfaces to include external interfaces if you want to connect from a remote machine.
  • The RPC server has TLS enabled by default, even for localhost. You may use the --notls option to disable it, but only when all listeners are on localhost interfaces.
  • The --rpclisten flag can be specified multiple times to listen on multiple interfaces as a couple of the examples below illustrate.
  • The RPC server is disabled by default when using the --regtest and --simnet networks. You can override this by specifying listen interfaces.

Command Line Examples:

Flags Comment
--rpclisten= all interfaces on default port which is changed by --testnet
--rpclisten=0.0.0.0 all IPv4 interfaces on default port which is changed by --testnet
--rpclisten=:: all IPv6 interfaces on default port which is changed by --testnet
--rpclisten=:9109 all interfaces on port 9109
--rpclisten=0.0.0.0:9109 all IPv4 interfaces on port 9109
--rpclisten=[::]:9109 all IPv6 interfaces on port 9109
--rpclisten=127.0.0.1:9109 only IPv4 localhost on port 9109
--rpclisten=[::1]:9109 only IPv6 localhost on port 9109
--rpclisten=:8336 all interfaces on non-standard port 8336
--rpclisten=0.0.0.0:8336 all IPv4 interfaces on non-standard port 8336
--rpclisten=[::]:8336 all IPv6 interfaces on non-standard port 8336
--rpclisten=127.0.0.1:8337 --listen=[::1]:9109 IPv4 localhost on port 8337 and IPv6 localhost on port 9109
--rpclisten=:9109 --listen=:8337 all interfaces on ports 9109 and 8337

The following config file would configure the dcrd RPC server to listen to all interfaces on the default port, including external interfaces, for both IPv4 and IPv6:

[Application Options]

rpclisten=