Engineering Logs for Troubleshooting & Debugging
Problem – SSL/TLS Handshake Failure When Calling Anthropic Claude API Our cloud‑managed service attempts to invoke the Anthropic Claude API over HTTPS. After a scheduled TLS certificate rotation on the Anthropic side, all outbound requests started failing with a handshake error. The failure manifested as immediate connection aborts, no data returned, and a surge in … Read more
Problem After upgrading the Kubernetes service mesh (Istio 1.18 → 1.20), LangChain‑based microservices that call external Large Language Model (LLM) APIs over HTTPS start failing with SSL/TLS handshake errors. The failures manifest as connection timeouts and requests.exceptions.SSLError exceptions in the Python runtime. Typical Symptoms Python traceback in LangChain worker pods: Traceback (most recent call last): File … Read more
PostgreSQL SSL Handshake Failure After Certificate Expiration in Docker Development Problem Description During a local AI model training run, the Python script that connects to the PostgreSQL service via psycopg2 started throwing: psycopg2.OperationalError: SSL SYSCALL error: certificate verify failed PostgreSQL container logs showed the corresponding server‑side error: 2026-09-12 10:45:23.456 UTC [1] LOG: SSL error: certificate … Read more
Problem – Model Evaluation Fails with SSL Certificate Expiration During a distributed evaluation run, PyTorch attempts to download model checkpoints, dataset shards, or auxiliary assets from remote HTTPS endpoints (e.g., torch.hub, torch.utils.model_zoo, torchvision.datasets, or torch.distributed RPC). When the TLS certificate presented by the server has expired, the download aborts and the entire evaluation job terminates. … Read more
Hugging Face Transformers SSL/TLS Handshake Failure in a Canary Deployment on Kubernetes Problem Description During a staged rollout of a model‑inference service that uses Hugging Face Transformers, a subset of pods (the canary) repeatedly fail to load pretrained models from https://huggingface.co. The failure manifests as: Log entry from the Transformers library: urllib3.exceptions.SSLError: HTTPSConnectionPool(host=’huggingface.co’, port=443): Max … Read more
Problem – Haystack TLS Handshake Fails in a Local Development Sandbox When running a multi‑service Haystack stack with Docker Compose, the inter‑node RPC layer aborts with TLS errors such as: SSLHandshakeException: certificate verify failed (self signed certificate in certificate chain) javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated OpenSSL error: verify error:num=20:unable to get local issuer certificate HaystackNodeError: TLS … Read more