DNSLookup

(Windows) Enable/disable DNS lookup of the Telnet client address.

Synopsis

[TelNet]
 
DNSLookup=n

Description

This setting enables or disables DNS lookup of the client address in the telnet daemon before passing the address to the Caché process that was created to service the connection. This determines the format of the client address returned by $IO and $ZIO in the Cache process.

The value n may be ON or OFF:

When ON (true) a DNS lookup of the client address is performed, and the client name is passed to Caché.
When OFF (false) no DNS lookup is performed, and the client address is provided in dotted decimal format.

DNS lookup should be disabled if a DNS server is not available to do the lookup, because a long delay will occur during login if the DNS server is not available.

Caché Telnet settings apply only to Windows configurations in which InterSystems supplies the Telnet servers. They do not apply on UNIX, Linux, or OpenVMS configurations, in which Telnet is supplied by the operating system vendor.

Examples

DNSLookup=ON

Range of Values

ON or OFF. The default is ON.

System Management Portal

Navigate to the [Home] > [Configuration] > [Advanced Settings] page. Select the Telnet category, and in the DNSLookup row, click Edit. Choose true or false.