Cannot access EX2 Ultra from Synology NAS

If you cannot access your EX2 Ultra from a Synology NAS, the issue is usually related to network settings, file sharing protocols, permissions, or firewall configuration. The My Cloud EX2 Ultra (by Western Digital) and a Synology NAS can communicate over SMB, NFS, or FTP, but both devices must be configured correctly.

Here’s how to troubleshoot the problem step by step.

First, verify both devices are on the same network. Check the IP address of your EX2 Ultra and your Synology NAS. They should share the same subnet. For example, if one device has an address starting with one network range and the other is on a different range, they will not see each other. If necessary, reboot your router and both NAS devices to refresh network assignments.

Next, confirm that file sharing services are enabled on the EX2 Ultra. Log into the EX2 Ultra dashboard and ensure SMB is turned on. SMB is the most common protocol used for NAS-to-NAS communication. If you plan to use NFS instead, enable NFS and configure the allowed IP addresses properly.

Then check permissions. Even if the share is visible, access will fail if credentials are incorrect. Create a dedicated user account on the EX2 Ultra and grant it read/write access to the shared folder. When mounting the remote folder on the Synology NAS, enter the correct username and password.

On the Synology side, open File Station and choose the option to mount a remote folder. Select CIFS/SMB if you’re using SMB. Enter the EX2 Ultra IP address and the exact share name. Make sure the path is correct, including capitalization.

Firewall settings can also block access. If either NAS has a firewall enabled, ensure the required ports for SMB are open. Temporarily disabling the firewall for testing can help confirm whether it’s the source of the issue.

If the connection still fails, check the SMB version compatibility. Some devices default to older SMB versions. In Synology DSM settings, try adjusting the minimum and maximum SMB protocol versions to ensure compatibility.

Finally, test connectivity using a computer. Try accessing the EX2 Ultra share from a PC. If the computer cannot access it either, the issue is likely on the EX2 Ultra side rather than the Synology NAS.

In most cases, the problem is related to network configuration, permissions, or SMB settings. Carefully reviewing these areas should restore access between your EX2 Ultra and Synology NAS.