Browse by Symptom
Use this page when you know what is happening, but not the exact error code yet.
Can’t connect
Connection, gateway, DNS, and internet-path failures.
Won’t install
Installers, package errors, content write failures, and broken setup state.
Won’t update
Update downloads, verification, and service communication failures.
Crashes on launch
Startup failures, launch blocking, and stuck process issues.
Sign-in failed
Account, session, and online service access failures.
Privacy / certificate warning
SSL, trust, certificate mismatch, and secure-session problems.
DNS / internet issue
Name-resolution, no-internet, and local network configuration problems.
Restore / recovery failed
iPhone restore, activation, lockout, and recovery-state issues.
Web page error status
4xx and 5xx response explanations for pages and services.