| Port No | 138 |
| Service Name | netbios-dgm |
| RFC Doc | 0 |
| Protocol | TCP |
| Description | NETBIOS Datagram Service. A principle rqmt for NetBIOS services on MS hosts (Win9x/ME/NT/Win2000). UDP 137 is used for browsing, directory replication, logon sequence, netlogon, pass-thru validation, printing support, trusts, and WinNT Secure Channel. Security Concerns: Key target in auth & DOS attacks. Block at all perimeters; NIC-filter on public-exposed MS hosts |
| Reference Link | Port Information Port 138: Netbios-dgm |
| Attack | Yes |
Catch threats immediately
We work side-by-side with you to rapidly detect cyberthreats
and thwart attacks before they cause damage.