# SUM cannot connect to a node

Symptom

SUM displays the message: `Unable to login or identify node as a supported device`.

Solution 1
Cause

SUM has connection issues with the remote node.

Action
Check the following:

- The node is active on the network.

- Network ports are open.

- Make sure that Windows nodes have the $Admin share enabled.

- Make sure that HTTP and SSH access are enabled for Linux nodes.

Solution 2
Cause

User credentials are incorrect.

Action
Verify that valid user credentials are provided.