Connection using telnet to a Host Not in DNS/hosts Stalls for Some Time at Connection Initiation (Doc ID 2173681.1)

Last updated on SEPTEMBER 01, 2016

Applies to:

Linux OS - Version Oracle Linux 6.4 with Unbreakable Enterprise Kernel [2.6.39] and later
Information in this document applies to any platform.

Symptoms

Telnet attempts to a server that doesn't have a reverse DNS lookup entry, and is not in the /etc/hosts file are slow to make an initial connection. It takes about 25-30 seconds to connect.
After the connection is established, the speed is as expected. However, if they add the IP address entries for the hosts in /etc/hosts file, then it connects instantly.

Changes

 NA

Cause

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