A simple fix for slow SSH connections caused by DNS lookups
Adding `UseDNS no` to `~/.ssh/config` eliminates SSH login delays caused by reverse DNS lookups on the client IP, which time out or stall through slow resolvers like systemd-resolved or VPS upstreams. For teams managing server fleets, ensuring correct reverse DNS for IP ranges removes the bottleneck for all users without requiring client-side changes.
SSH Login Taking Forever? Check Your DNS Settings
The Situation
You type ssh user@server, hit enter, and wait. And wait. Ten seconds later, the password prompt finally appears. It's not network latency — ping is fine. It's not the server — other people connect instantly. It's just your SSH client hanging for no obvious reason.
This is one of those problems that wastes a small amount of time on a regular basis, which adds up to a large amount of time over months.
What Was Done
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