Delay or slow ssh login on Linux (4290962)

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Title

Delay or slow ssh login on Linux
Description

Delay or slow ssh login on Linux
Cause

DNS issue. When you log into the SSH server on linux, it will do a reverse DNS lookup of the client for security reasons.
Resolution

To test DNS reverse lookup do the following command:

nslookup <machine you are sshing from ip address>

RESOLUTION 1:

Edit DNS and set up proper reverse DNS zones

RESOLUTION 2:

Edit sshd_config and add UseDNS no setting.

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