QRadar port usage - IBM

Security risks: Netbios, port exposure & remote access Sep 26, 2019 How to open a port in the firewall on Windows 10 May 31, 2018

Ports used for connections - Configuration Manager

TCP port 139 is SMB over NETBIOS. NETBIOS is a transport layer protocol designed to use in Windows operating systems over the network. TCP 445 is SMB over IP. This is a newer version where SMB can be consumed normally over the IP networks. Check If Port 137,138,139 and 445 Is Open List of TCP and UDP port numbers - Wikipedia

Review the list of common ports that IBM QRadar services and components use to communicate across the network. You can use the port list to determine which ports must be open in your network. For example, you can determine which ports must be open for the QRadar Console to communicate with remote event processors.

The problem with NetBIOS - TechRepublic Both of these approaches, however, tend to increase the attack surface of a network. The ports that we’d have to open to the Internet are UDP/137, UDP/138, and TCP/139. Internet Ports Blocked or Restricted by Cox The Post Office Protocol (POP) is a mail protocol used for receiving email. We block this port because without SSL enabled, it is not encrypted and leaves customers vulnerable to having their user information and passwords compromised. 135, 137 / UDP, 135, 139 / TCP, 445 MS-DC – NetBIOS How do you unblock ports 139 & 445 for SMB File Sharing Feb 04, 2015