---
id: 1d9b21a0-4293-46a0-8be1-05414e641ce9
type: problem
title: "Intermittent SSL connection failures from internal network"
tags: [networking, dns, ssl, troubleshooting, pihole, npm]
importance: 0.7
confidence: 0.8
created: "2026-02-05T22:37:50.922156+00:00"
updated: "2026-02-05T22:37:50.922156+00:00"
relations:
  - target: 62b643f2-5ed7-4ea5-b87f-ef0687ad83ec
    type: SOLVES
    direction: incoming
    strength: 0.5
---

Symptom: ERR_SSL_UNRECOGNIZED_NAME_ALERT appears intermittently when accessing internal services (like Gitea, NPM proxy hosts) from allowed internal network (10.0.0.0/24, 10.10.0.0/24).

Pattern: Works fine for a while, then fails with SSL error, then works again. Access lists are correctly configured. Certificate is valid.

Key diagnostic clue: Issue occurs even from internal network where access should always work. DNS returns both IPv4 (internal) and IPv6 (Cloudflare) addresses.

Related to: Pi-hole DNS configuration, IPv6 preference in modern operating systems, split-horizon DNS, Cloudflare proxy configuration.