0.28 binds to default ports when -port or -rpcport set #31372

1. 
   dpc commented at 9:23 pm on November 25, 2024: none

   Is there an existing issue for this?

   • I have searched the existing issues

   Current behaviour

   0bitcoind --datadir=(mktemp -d) -port=51234 -rpcport=51235
   

   fails for me with:

   02024-11-25T21:18:29Z [net:error] Unable to bind to 127.0.0.1:8334 on this computer. Bitcoin Core is probably already running.
   12024-11-25T21:18:29Z [error] Unable to bind to 127.0.0.1:8334 on this computer. Bitcoin Core is probably already running.
   2Error: Unable to bind to 127.0.0.1:8334 on this computer. Bitcoin Core is probably already running.
   32024-11-25T21:18:29Z [error] Failed to listen on any port. Use -listen=0 if you want this.
   4Error: Failed to listen on any port. Use -listen=0 if you want this.
   

   (because I already have one listening)

   This was not the case in 0.27. I noticed when upgrading nixpkgs in our test suite (which switches bitcoind from 0.27 to 0.28). We used to set port and rpcport in the config and that was it. Now we need to set also bind and rpcbind.

   Expected behaviour

   Unclear if this is a bug, but clearly a change in the behavior, so worth reporting.

   Steps to reproduce

   0bitcoind --datadir=(mktemp -d) -port=51234 -rpcport=51235
   

   , check ports with sudo netstat -l -p -n | grep bitcoind

   Relevant log output

   No response

   How did you obtain Bitcoin Core

   Package manager

   What version of Bitcoin Core are you using?

   v28.0.0

   Operating system and version

   NixOS 24.11-beta

   Machine specifications

   No response

2. 
   mzumsande commented at 9:39 pm on November 25, 2024: contributor

   Thanks for the report - this is known, see #31133 . An immediate fix is to use -bind instead of -port, as you mentioned. It is still being discussed whether and how this should be fixed, see the linked issue and #31223.
3. 
   dpc commented at 9:41 pm on November 25, 2024: none

   Thanks. Closing, since a dup.
4. dpc closed this on Nov 25, 2024

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dpc mzumsande