The DNS Settings for the domain should provide the information for where the Authentication Servers are and the port number using the TXT Record Type. The AS (Authentication Server) listens to both UDP and TCP of the same port number.

The field has the following format:

AS=HostName:PortNumber[;Hostname:PortNumber]:TTL

AS - Authentication Servers
: - is used to separate between the host name and the port number. The TTL is the last field separated by : ; - is used to separate between the host names
[ ] - optional additional host names
TTL – Time To Live of this record in minutes

Example:

AS=AS10.simplicato.com:2550;AS10.simplicato.com:2550:1800