# WNS(Windows Notification Service) is not reachable

Last updated: July 24, 2026

## Problem

Trying to reach a managed mobile device fails and you get the error message "WNS is not reachable".

## Cause

This could happen due to various reasons such as:

- Port Blocked
- Proxy not configured

## Resolution

**Port Blocked:**

Ensure that the following ports are open on the Mobile Device Manager Plus proxy/firewall:

HTTPS ports 9383 and 8383 should be opened. This will allow the Mobile Device Manager Plus Server to communicate with the MDM Agent.

TCP port 443 should be opened. This will allow the Mobile Device Manager Plus Server to communicate with WNS.

Ensure that the Mobile Device Manager Plus server has permission to reach [https://login.live.com](https://login.live.com) and [https://*.notify.windows.com](https://*.notify.windows.com).

**Proxy Not Configured:**

If the network in which Mobile Device Manager Plus server is installed has a proxy, ensure that the proxy settings are configured. Verify the user name and the password for proxy authentication, so that the server can reach WNS.

**Applies to:** Scanning the mobile device, Distributing Apps, Associating Profiles

**Keywords:** MDM scanning, Associating profiles, WNS, Mobile Device Management.