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AJMost people think SSH is just “login to a server”.
That’s why debugging SSH feels random.
Here’s what actually happens when you run ssh user@server 👇
1️⃣ DNS resolution
The hostname is converted to an IP.
If DNS is slow or broken, SSH feels slow before it even starts.
2️⃣ Network connection
Your machine tries to reach port 22 on the server.
If the port is blocked, SSH never reaches the server.
3️⃣ Key and authentication checks
SSH checks keys, permissions, and allowed users.
Wrong permissions on ~/.ssh can break login.
4️⃣ Server-side config checks
The server reads sshd_config.
Settings like allowed users, auth methods, and timeouts apply here.
5️⃣ Shell startup
Only after all checks pass, you actually get a shell.
That’s why SSH slowness is rarely “just network”.
It’s usually DNS, keys, permissions, or config.
Debug the flow.
Don’t guess.
Save this.
It makes SSH issues boring to solve.
#ssh #linux #aws #devops #tech
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