Start/notes.ini Parameters/DEBUG_TCP

DEBUG_TCP

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Parameter: DEBUG_TCP
Short description: Tracing of the TCP/IP layer – logs connection setup, socket options, and network errors of the Domino server.

Profile

Parameter
DEBUG_TCP
Category
Logging / Debug
Component
Server
Available since
9.0.1
Supported versions
9.0.1, 10.0, 11.0, 12.0, 14.0, 14.5, 14.5.1
GUI equivalent
notes.ini only (no GUI)
Possible values
0 = off, 1 = on

Description

DEBUG_TCP enables diagnostic output for the TCP/IP network layer of the Domino server (NRPC and all TCP-based tasks). Among other things, opening and closing of sockets, set socket options (keep-alive, NoDelay), DNS resolutions, and network error codes are logged. Helpful for intermittent connection drops, firewall/NAT issues, or for tuning keep-alive behavior.

Example configuration

DEBUG_TCP=1

Notes & pitfalls

  • Produces a lot of log lines – use only briefly for diagnosis.
  • Useful in combination with DEBUG_SESSION_IO=1 (NRPC sessions) and DEBUG_SSL=2 (for TLS issues).
  • Takes effect immediately; no restart required.
  • Provides no payload content, only connection/stack metadata.