log: frequent pcp: Mapping failed with result NOT_AUTHORIZED (code 2) logs as net:warning #34114

1. 
   0xB10C commented at 11:16 am on December 19, 2025: contributor

   Is there an existing issue for this?

   • I have searched the existing issues

   Current behaviour

   On my node at home (not a monitoring node), I’m seeing three pcp: Mapping failed with result NOT_AUTHORIZED (code 2) logs every five minutes logged as net:warnings. I think that’s too frequent.

    0...
    12025-12-19T10:32:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
    22025-12-19T10:32:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
    32025-12-19T10:32:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
    42025-12-19T10:37:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
    52025-12-19T10:37:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
    62025-12-19T10:37:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
    72025-12-19T10:42:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
    82025-12-19T10:42:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
    92025-12-19T10:42:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   102025-12-19T10:47:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   112025-12-19T10:47:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   122025-12-19T10:47:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   132025-12-19T10:52:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   142025-12-19T10:52:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   152025-12-19T10:52:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   162025-12-19T10:57:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   172025-12-19T10:57:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   182025-12-19T10:57:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   192025-12-19T11:00:54Z Flushed fee estimates to fee_estimates.dat.
   202025-12-19T11:02:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   212025-12-19T11:02:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   222025-12-19T11:02:26Z [net:warning] pcp: Mapping failed with result NOT_AUTHORIZED (code 2)
   23...
   

   Expected behaviour

   Fewer of the pcp warnings.

   Steps to reproduce

   Run a node behind a router that returns NOT_AUTHORIZED for PCP (?)

   Relevant log output

   No response

   How did you obtain Bitcoin Core

   Package manager

   What version of Bitcoin Core are you using?

   v30.0 (via nixpkgs)

   Operating system and version

   NixOS

   Machine specifications

   Machine is behind a home internet router with PCP disabled by default. I’m running the node with txindex=1, addnode, and otherwise default configuration.

2. 
   0xB10C commented at 11:20 am on December 19, 2025: contributor

   My understanding is that this is a different log message from #33301 and https://github.com/bitcoinknots/bitcoin/issues/184. However, I haven’t checked if #33311 fixed it too.

   edit: It seems related, but is a different log message.

   https://github.com/bitcoin/bitcoin/blob/516ae5ede44a8a6abc59e90f9d89913e254524f4/src/common/pcp.cpp#L511

3. 0xB10C renamed this:
   bug: log: frequent `pcp: Mapping failed with result NOT_AUTHORIZED (code 2)` logs as `net:warning`
   log: frequent `pcp: Mapping failed with result NOT_AUTHORIZED (code 2)` logs as `net:warning`
   on Dec 19, 2025
4. 
   fanquake commented at 3:25 pm on December 19, 2025: member

   cc @laanwj @willcl-ark

Contributors
0xB10C fanquake