4 • Crestron Flex Phones
Security Reference Guide — Doc. 9313A
Function
Destination Port
From (Sender)
To (Listener)
Notes
HTTPS
443/TCP
Device
Microsoft
Portal
For Microsoft portal
services only and not
required for device
functionality. HTTPS
services such as routing
lookups and file transfers
may be used.
HTTPS
443/TCP
Device
Firmware
Server
Firmware upgrade path
HTTPS
443/TCP
Device
APK Server
APK upgrade path
DHCP
67/UDP
Device
DHCP Server
DHCP addressing
DHCP
68/UDP
DHCP Server
Device
DHCP addressing
HTTP
80/TCP
End User
Workstation
Device
Web configuration
WPAD
80/TCP
Device
WPAD File
Server
Gets the PAC file from
the server.
Remote Syslog
Configurable
Device
Remote Syslog
Server
Uses TLS
HTTP Proxy
Configurable
Device
Proxy Server
HTTPS Proxy
Configurable
Device
Proxy Server
Kerberos
88/TCP
Device
KDC (Key
Distribution
Center)
DNS
3/TCP/UDP
Device
DNS server
