> ## Documentation Index
> Fetch the complete documentation index at: https://moengage.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Why Does the "APNS Client Connection" Error Occur?

> Resolve the APNS Client Connection error in iOS push caused by an expired or revoked certificate. Learn how to generate and upload new credentials.

## Problem

When sending push notifications in iOS to a reachable user, the "APNS Client Connection" error occurs.

## Explanation

This error can happen for the following reasons:

* The APNS certificate linked to the PEM file on the MoEngage dashboard has expired or been revoked.
* The AuthKey has been revoked on the Apple Developer account.

## Solution

Create a new PEM file or AuthKey and upload it on the MoEngage dashboard.