| Port No | 139 |
| Service Name | NETBIOS Session Service |
| RFC Doc | 0 |
| Protocol | TCP |
| Description | TCP NetBIOS connections are made over this port, usually with Windows machines but also with any other system running Samba (SMB). These TCP connections form "NetBIOS sessions" to support connection oriented file sharing activities. |
| Reference Link | Port Information |
| Attack | Yes |
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