Debugging TCP connection

[Gitopolis]

I'm trying to connect two ndnds with a tcp connection: ndnd-1 is behind a loadbalancer, ndnd-2 behind NAT.
When I run ndnd dv link-create tcp://<redacted>:6364 in the ndnd-2 I see following in the logs:

• ndnd-2 logs:

  time=2025-11-10T01:42:40.805Z level=INFO msg="Connected socket - Face UP" tag="unicast-tcp-transport (faceid=6 remote=tcp4://<redacted>:6364 local=tcp4://192.168.5.15:44348)"
  

• ndnd-1 logs:

  time=2025-11-10T01:52:32.503Z level=INFO msg="Accepting new TCP face" tag="tcp-listener (tcp4://0.0.0.0:6364)" uri=tcp4://10.202.0.29:56017
  time=2025-11-10T01:52:32.547Z level=ERROR msg="Unable to decode incoming frame" tag="link-service (unicast-tcp-transport (faceid=16 remote=tcp4://10.202.0.29:56017 local=tcp4://10.202.0.27:6364))" err="There exists an unrecognized field that has a critical type number: 71"
  time=2025-11-10T01:52:32.547Z level=ERROR msg="Unable to decode incoming frame" tag="link-service (unicast-tcp-transport (faceid=16 remote=tcp4://10.202.0.29:56017 local=tcp4://10.202.0.27:6364))" err="There exists an unrecognized field that has a critical type number: 101"
  time=2025-11-10T01:52:32.548Z level=ERROR msg="Received packet of unknown type" tag="link-service (unicast-tcp-transport (faceid=16 remote=tcp4://10.202.0.29:56017 local=tcp4://10.202.0.27:6364))"
  time=2025-11-10T01:52:32.548Z level=ERROR msg="Unable to decode incoming frame" tag="link-service (unicast-tcp-transport (faceid=16 remote=tcp4://10.202.0.29:56017 local=tcp4://10.202.0.27:6364))" err="There exists an unrecognized field that has a critical type number: 87"
  time=2025-11-10T01:52:32.548Z level=ERROR msg="Unable to decode incoming frame" tag="link-service (unicast-tcp-transport (faceid=16 remote=tcp4://10.202.0.29:56017 local=tcp4://10.202.0.27:6364))" err="There exists an unrecognized field that has a critical type number: 99"
  time=2025-11-10T01:52:32.548Z level=ERROR msg="Unable to decode incoming frame" tag="link-service (unicast-tcp-transport (faceid=16 remote=tcp4://10.202.0.29:56017 local=tcp4://10.202.0.27:6364))" err="Failed to parse field 100: There exists an unrecognized field that has a critical type number: 101"
  time=2025-11-10T01:52:32.643Z level=INFO msg="Accepting new TCP face" tag="tcp-listener (tcp4://0.0.0.0:6364)" uri=tcp4://10.202.0.28:45172
  

How do I debug it? I have no idea where to look at.

• ndnd-1 config:

  dv:
    network: /test1
    router: /test1/test1-dhl4n
    keychain: dir:///etc/ndn/keys
    trust_anchors:
    - /test1/KEY/%2C%02%B23%27%FC%F9%08/NA/v=1762659611498
    - /test2/KEY/%7DI%CFi%B6%CD%AC%CF/NA/v=1762659753379
  fw:
    core:
      log_level: INFO
    faces:
      queue_size: 1024
      congestion_marking: true
      lock_threads_to_cores: false
      udp:
        enabled_unicast: true
        enabled_multicast: false
        port_unicast: 6363
        lifetime: 600
        default_mtu: 1420
      tcp:
        enabled: true
        port_unicast: 6364
        lifetime: 600
        reconnect_interval: 10
      unix:
        enabled: true
        socket_path: /run/ndnd/test1.sock
      websocket:
        enabled: false
        bind: ''
        port: 9696
        tls_enabled: false
    fw:
      threads: 8
      queue_size: 1024
      lock_threads_to_cores: false
    mgmt:
      allow_localhop: false

• ndnd-2 config

  dv:
    network: /test2
    router: /test2/test2-4bt4l
    keychain: dir:///etc/ndn/keys
    trust_anchors:
    - /test1/KEY/%2C%02%B23%27%FC%F9%08/NA/v=1762659611498
    - /test2/KEY/%7DI%CFi%B6%CD%AC%CF/NA/v=1762659753379
  fw:
    core:
      log_level: INFO
    faces:
      queue_size: 1024
      congestion_marking: true
      lock_threads_to_cores: false
      udp:
        enabled_unicast: true
        enabled_multicast: false
        port_unicast: 6363
        lifetime: 600
        default_mtu: 1420
      tcp:
        enabled: false
        port_unicast: 6363
        lifetime: 600
        reconnect_interval: 10
      unix:
        enabled: true
        socket_path: /run/ndnd/test2.sock
      websocket:
        enabled: false
        bind: ''
        port: 9696
        tls_enabled: false
    fw:
      threads: 8
      queue_size: 1024
      lock_threads_to_cores: false
    mgmt:
      allow_localhop: false

The ndnd version is efc6b86