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Título
Delay or slow ssh login on Linux -
Descripción
Delay or slow ssh login on Linux
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Causa
DNS issue. When you log into the SSH server on linux, it will do a reverse DNS lookup of the client for security reasons.
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Resolución
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.