# messaging\_apple-push **Explanation** The messaging\_apple-push NDM is designed to detect the presence of messaging applications on a network. It detects network traffic associated with Apple's Push Notification Service (APNS), specifically when it is used for the messaging app iMessage. **What to Look For** To investigate the messaging\_apple-push NDM event, you should look for network traffic associated with Apple's Push Notification Service. This may be seen through various application and protocol signatures, such as SSL/TLS traffic over port 443 or HTTP/2 traffic. Additionally, you should examine endpoints for the presence of the iMessage application or any other messaging applications associated with APNS traffic. This NDM event is triggered when APNS traffic is discovered on the network, indicating that messaging applications may be in use and potentially exposing sensitive information. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.fusion.vectra.ai/detection-models/library/operational-governance/messaging_apple-push.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.