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I have bitcoin-qt running on a Windows machine in my network started with the following command and empty config file (hence, all default configurations).

bitcoin-qt.exe -server=1 -rest=1

I can query the API endpoint of the node on the 8332 port; for instance:

curl http://localhost:8332/rest/chaininfo.json

I want to access the same REST API endpoint from the second computer on the network. On the second computer, I can reach the 8333 endpoint, but not 8332.

$ nc -vz 196.168.1.2 8333
Connection to 192.168.1.2 port 8333 [tcp/*] succeeded!

$ nc -vz 196.168.1.2 8332
nc: connect to 192.168.1.2 port 8332 (tcp) failed: Connection refused

On the first computer (the one that is running bitcoin-qt), it seems port 8333 can be reached with the computer's IP in the LAN while port 8332 is only reachble via localhost:

$ netstat -aon | findstr 8333
  TCP    0.0.0.0:8333           0.0.0.0:0              LISTENING       117384
  TCP    192.168.1.2:1033     84.212.130.217:8333    ESTABLISHED     117384
  TCP    192.168.1.2:1034     50.39.164.136:8333     ESTABLISHED     117384
  TCP    192.168.1.2:1035     45.132.158.199:8333    ESTABLISHED     117384
  TCP    192.168.1.2:1045     95.84.137.91:8333      ESTABLISHED     117384
  TCP    192.168.1.2:1065     82.197.215.125:8333    ESTABLISHED     117384
  TCP    192.168.1.2:1076     209.237.133.54:8333    ESTABLISHED     117384
  TCP    192.168.1.2:1091     178.48.160.142:8333    ESTABLISHED     117384
  TCP    192.168.1.2:1093     95.110.133.223:8333    ESTABLISHED     117384
  TCP    192.168.1.2:1106     5.188.62.18:8333       ESTABLISHED     117384
  TCP    192.168.1.2:1112     108.248.87.92:8333     ESTABLISHED     117384
  TCP    [::]:8333              [::]:0                 LISTENING       117384


$ netstat -aon | findstr 8332
  TCP    127.0.0.1:8332         0.0.0.0:0              LISTENING       117384
  TCP    [::1]:8332             [::]:0                 LISTENING       117384

Mind [::] for port 8333 and [::1] for port 8332.

I am wondering what changes need to be made in order to reach the 8332 port of the node from another computer in the network.

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1 Answer 1

Reset to default
2

The rest interface uses the RPC options for setup. You can use the -rpcbind option to bind the interface to a different address and port, and set the -rpcallowip. Note that this will also affect the RPC interface.

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  • Could you provide a working example? I used rpcbind according to the following docs, and still cannot get the address correct. github.com/bitcoin/bitcoin/blob/…
    – Dr. Strangelove
    Commented Aug 29, 2022 at 5:04
  • For example, if the my computer's LAN IP is 192.168.1.10, then to expose my the rpc interface on LAN, I would do -rpcbind=192.168.1.10.
    – Ava Chow ♦
    Commented Aug 29, 2022 at 15:30
  • Thanks! I have actually tried that, but that does not seem to be enough; e.g., above-linked docs read "This option is ignored unless -rpcallowip is also passed.". I have tried passing -rpcallowip arg as well, but that does not seem enough either.
    – Dr. Strangelove
    Commented Aug 29, 2022 at 17:50
  • What value did you pass for -rpcallowip? In my example, you would do -rpcallowip=192.168.1.1/24.
    – Ava Chow ♦
    Commented Aug 29, 2022 at 22:33
  • Could you please elaborate? e.g., what is 24?
    – Dr. Strangelove
    Commented Aug 29, 2022 at 22:51

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