Last updated: July 24, 2026

Access to MDM server blocked

Problem

On clicking Sync from the ManageEngine MDM Self Service app (previously ManageEngine MDM app), to reach the MDM server, the error message, Access blocked! Contact IT Admin is shown.

Cause

The error might be due to one of the following reasons:

• Server is inactive.
• Server is blocked by your organization's firewall or filter.

Resolution

• Restart the server and try Sync again.
• Ensure that the required ports and domains are allowlisted on the firewall/filter.

If the problem still persists, contact mdm-support@manageengine.com (MDM On-Premises) or mdmcloud-support@manageengine.com (MDM Cloud)