What common networking errors does this skill help solve?

It helps resolve DNS resolution failures, TLS certificate errors (like -9806), POSIX connection refused errors, and issues related to VPN or cellular network transitions.

Can I use this skill to debug issues in the iOS Simulator?

The skill provides guidance, but emphasizes testing on real devices because the simulator uses the macOS networking stack and can hide cellular-specific issues or network transitions.

Why shouldn't I switch to a socket-based library instead?

Network.framework is highly optimized for Apple platforms, handling IPv6, WiFi Assist, and proxy evaluation natively; switching to sockets often introduces over 100 edge cases that Apple's framework already handles.

Does this skill work for URLSession issues?

Yes, because Network.framework powers URLSession internally, these diagnostic patterns apply to both direct framework usage and URLSession-based networking.

Axiom Network.framework Diagnostics

Name: Axiom Network.framework Diagnostics
Author: CharlesWiltgen

byCharlesWiltgen

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233

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Mobile Development

Provides systematic diagnostics and troubleshooting patterns for Apple's Network.framework to resolve connection issues in xOS applications.

Axiom Network.framework Diagnostics is a specialized skill designed to help developers debug complex networking issues in iOS, iPadOS, watchOS, and tvOS applications. It offers a production-tested methodology for identifying the root causes of connection timeouts, TLS handshake failures, and data transmission errors. By leveraging a structured decision tree and specific diagnostic patterns, this skill guides users through enabling logging, analyzing POSIX errors, and validating network transitions. It is essential for teams needing to resolve critical connectivity bugs and ensure their apps perform reliably across WiFi, cellular, and VPN environments.

Key Features

01Instructions for effective packet capture and Xcode scheme logging

02Detailed troubleshooting for DNS, TLS, and POSIX 61/50 errors

03Structured decision tree for rapid networking triage

04233 GitHub stars

05Best practices for handling WiFi-to-cellular transitions and viability updates

06Guidance on real-device testing vs. simulator networking limitations

Use Cases

01Debugging intermittent connection drops and timeouts in production iOS apps

02Diagnosing why data is sent but not arriving at the receiver due to framing issues

03Resolving kSSLPeerCertInvalid (-9806) and other TLS handshake failures

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add charleswiltgen/axiom axiom-networking-diag

For use in Claude.ai and ChatGPT

Download Skill