Windows 10 IoT 2021 LTSB – option for UHX65A/UHX86A

msrpc / RpcSs

135

TCP

Active

If necessary, depending on the configuration; see Microsoft Windows® documentation.

Optional

Optional

Microsoft Remote Procedure Call

netbios-ssn / system

139

TCP

Active

Optional

Optional

Protocol for connecting two computers

CDPsvc

5040

TCP

Active

Optional

Optional

Optional

Connection to Bluetooth devices

Isass.exe

49664

TCP

Active

If necessary, depending on the configuration; see Microsoft Windows® documentation..

Yes

Optional

Check validity of user login

wininit.exe

49665

TCP

Active

Yes

Optional

Windows initialization

EventLog

49666

TCP

Active

Yes

Optional

Task event logger

Schedule

49667

TCP

Active

Yes

Optional

Task scheduling

Spooler

49668

TCP

Active

Yes

Optional

Task spooling

services.exe

49669

TCP

Active

Yes

Optional

Service Control Manager

microsoft-ds / system

445

TCP

Active

Optional

Optional

Network file sharing protocol

ntp / W32Time

123

UDP

Active

Optional

Yes

Optional

Network Time Protocol (time synchronization)

netbios-ns / system

137

UDP

Active

Optional

Optional

Optional

Name resolution via WINS in local networks

netbios-dgm / system

138

UDP

Active

Optional

Optional

Optional

Fault detection and repairs in local networks/file and printer sharing

upnp / SSDPSRV

1900

UDP

Active

Optional

Optional

Optional

Automatic detection and interaction with devices

mmcc / CDPSvc

5050

UDP

Active

Optional

Optional

Optional

Connection to Bluetooth devices

mdns / Dnscache

5353

UDP

Active

Optional

Optional

Optional

Resolution of host names to IP addresses (if no DNS server exists)

llmnr / Dnscache

5355

UDP

Active

Optional

Optional

Optional

Name resolution for hosts in the local system

iphlpsvc

54140

UDP

Active

Optional

Yes

Optional

IP auxiliary service

SSDPSRV

54141 –

54144

UDP

Active

Optional

Optional

Optional

Detection of SSDP devices