# FCM Registration Error

Last updated: July 24, 2026

## Problem

You are trying to enroll an Android device and get the error message "FCM Registration Error".

## Cause

This could happen due to one of the following reasons:

- [Port(s)/Domain(s) Blocked](https://www.manageengine.com/mobile-device-management/kb/mdm-gcm-registration-error.html#port_blocked)
- [Unavailability of Google Services](https://www.manageengine.com/mobile-device-management/kb/mdm-gcm-registration-error.html#google_service_unavailable)
- [Date/Time settings in the device](https://www.manageengine.com/mobile-device-management/kb/mdm-gcm-registration-error.html#date-time)

## Resolution

### Port(s)/Domain(s) Blocked (Applicable only for MDM On-Premises)

Ensure the following domains are allowlisted in the firewall and/or other third-party filters:

- mtalk.google.com:5228
- mtalk.google.com:5229
- mtalk.google.com:5230
- android.clients.google.com:443
- android.googleapis.com

### Unavailability of Google Services

If Google Services including FCM is unavailable in your country, then MDM cannot contact/manage the Android device. To ensure MDM can contact the device, change the communication mode by navigating to the **Enrollment** tab and select **ManageEngine MDM Self Service app (previously ManageEngine MDM app)** under the **Android** section. Under **Configure Mode of Communication**, select **Periodic** as the communication type and save the settings. Period mode of communication ensures the **MDM server contacts the device once every 60 minutes**. However, on-demand security features such as Corporate Wipe, Remote lock etc., may not function properly.

### Date/Time settings in the device

Ensure the date/time settings in the device are correct.

If the above resolutions don't work, try enrolling the device via Cellular Data. If the issue still remains unresolved, contact MDM On-Premises support (**mdm-support@manageengine.com**) or MDM Cloud support (**mdmcloud-support@manageengine.com**).

**Applies to:** Proxy, Device Scanning

**Keywords:** FCM, Enrollment failure, Device Scanning