Skip to content
IT Atlas

Port

Port 445

Conventionally used by SMB. Port assignments are conventions, so confirm the actual listener before you write a rule around this number.

TCPEncrypted: Optional

Protocols on this port

SMB

Windows file and printer sharing

Security: Disable SMBv1, require signing, block at the perimeter

TCP · Encrypted: Optional

Where this port appears in the documentation

Active Directory

Microsoft's on premises directory service, providing authentication, authorisation, policy and object management for Windows environments.

SMB

Server Message Block is the Windows file and printer sharing protocol, operating over TCP/445 in modern deployments.

Exposure guidance

Decide reachability from the identity of the caller, not from the port number. If the service on this port carries credentials or administrative control, restrict it to an administrative network, require strong authentication, and log every session that reaches it.

Nearby ports

Port 443Port 464

In the knowledge graph

Open the interactive map centred on this entity to see everything it connects to and travel outwards from there.

Explore port 445 in the knowledge graph