## The problem
Issue langchain-ai/langsmith-sdk#1769 (closed, 20 comments): Failed to send compressed multipart ingest: connection errors when posting traces to the LangSmith API. It used to work a few months ago. Tried with and without async mode, local (Ollama) and remote (Groq) LLMs, with and without a checkpointer. Every (a)invoke fails to ingest.
## The fix
If LangSmith ingest fails with connection errors from APAC even though it used to work, point the SDK at the regional endpoint: set LANGSMITH_ENDPOINT=https://apac.api.smith.langchain.com. The default US endpoint causes connection failures from APAC regions; switching to the regional endpoint fixed the ingest failures for the reporter.
## Notes
Thread: https://github.com/langchain-ai/langsmith-sdk/issues/1769. Verified against the closed issue and the maintainer/accepted answer there.