User Guide: AT-RADGate for VST-APL/VST-VRT version 1.2.0

# TCP or UDP port used by AT-RADgate

## Ports AT-RADgate listens on

Services provided by AT-RADgate listen on the following ports. Listening ports can be changed for some services. But before changing them, make sure that each service port is not used by any other service.

Table 1: Listening port numbers
Service Name | Port Number | Communication Direction | Note
--- | --- | --- | ---
Web GUI | 443/TCP | Bidirectional | This can be changed in "Web Service" on the Network Settings page.
Web management page redirection | 80/TCP | Bidirectional | When the standby port number of the Web setting page is other than 80, this number is used to forward messages received at this number to the standby port number of the Web management page.
Internal DNS server | 53/TCP 53/UDP | − | There is no communication with external hosts.
RADIUS Authentication | 1812/UDP | Bidirectional |
RADIUS Accounting | 1813/UDP | Bidirectional |
Service Management | 30001 - 30032 /TCP 30001 - 30032/UDP | − | This is a port reserved for information exchange between each AT-RADgate service.

## Packets AT-RADgate transmits

Services provided by AT-RADgate may transmit packets to the following destinations. If there are intermediate devices such as firewalls, they should be properly configured to allow those packets.

Table 2: Packets transmitted by AT-RADgate services
Feature | Destination | Port Number | Communication Direction | Note
--- | --- | --- | --- | ---
Event Log | Configured Host | 514/UDP | Sending Direction | If you have set an external Syslog server in "Syslog" on the Logging Settings page, packets addressed to that host are sent. The port numbers shown in the examples here are the default values that are used if the port number is omitted.
SMTP Client | Configured Host | Configured port/TCP | Bidirectional | If you set an SMTP Server on the Email Settings page, packets are sent to the set host when sending email.
DNS Client | Configured Host | 53/UDP | Bidirectional | Sends packets for DNS name resolution. The destination address is the DNS server you set in the AT-RADgate Application Configuration for VST-APL or VST-VRT.
Windows Active Directory Integration | − | − | − | If you configure a Windows Active Directory Domain, packets are sent to communicate with the Windows Domain Controller. For information about packets sent, refer to Windows Server documentation.
RADIUS Proxy | Configured Host | Configured port/UDP | Bidirectional | If you specify Forwarding Servers on the RADIUS Proxy on the Proxy Settings page, packets are sent to the specified host when forwarding RADIUS requests.
LDAP Client | Configured Host | Configured port/TCP | Bidirectional | If you specify LDAP Server on the LDAP Server Settings page, packets are sent to the configured host when communicating with the LDAP Server.

29 Jan 2026 17:20