![]() ![]() Enable a firewall or endpoint protection to protect these ports from attackers.So how do we manage to keep our networks secure and maintain application functionality and uptime? Here are some options to secure these two important and well-known ports. ![]() Leaving network ports open to enable applications to function is a security risk. Using TCP allows SMB to work over the internet. Port 445: Later versions of SMB (after Windows 2000) began to use port 445 on top of a TCP stack.NetBIOS is an older transport layer that allows Windows computers to talk to each other on the same network. Port 139: SMB originally ran on top of NetBIOS using port 139.As such, SMB requires network ports on a computer or server to enable communication to other systems. SMB has always been a network file sharing protocol. Likewise: Likewise is a multi-protocol, identity aware network file sharing protocol that was purchased by EMC in 2012.Tuxera SMB: Tuxera is also a proprietary SMB implementation that runs in either kernel or user-space.MoSMB: MoSMB is a proprietary SMB implementation by Ryussi Technologies.NQ: NQ is another portable file sharing SMB implementation developed by Visuality Systems.Samba: Samba is an open-source implementation of Microsoft Active Directory that allows non-Windows machines to communicate with a Windows network.CIFS: CIFS is a common file sharing protocol used by Windows servers and compatible NAS devices.Many people mistake CIFS as a different protocol than SMB, when in fact they use the same basic architecture. For example, Common Internet File System (CIFS) is a specific implementation of SMB that enables file sharing. Just like any language, computer programmers have created different SMB dialects use for different purposes. Microsoft continues to make advancements to SMB for performance and security: SMB2 reduced the overall chattiness of the protocol, while SMB3 included performance enhancements for virtualized environments and support for strong end-to-end encryption. Need help figuring things out? Ask Varonis. Weird network traffic and suspicious port connections on your network are signs you might have been breached. ![]()
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