# SUM does not add an SMB-enabled Linux node with Unknown node type

Symptom

When the SMB service is running on a Linux server, it provides access to the path `\\<ip>\admin$` or mimics the existence of this path. Therefore, if you add such a Linux node to SUM in CLI, IPF, or GUI modes without providing the node type, the node is identified as a Windows node. As a result, SUM displays the error message `Invalid username or password.`

Action
Do not add an SMB-enabled Linux node without specifying the node type.