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== SSH to remote server ==

;GCP VM SSH Connection Timed out

Existing connection timed out or a new one?

Was it idle connection?

It not, is there any network disconnection/lantency/congestion?

SSH Packets are reaching Destination? TCPDump on Destination. If not check:

- IP Correct

- Using IP Correct in client side.

- DNS Correct

- DNS Correct? try host file entry or direct ip access

- Port Correct

- Routes in intermediate devices.

- Packets going out of Client? check dest trace. Iptables might hv blocked, or networking issue.

If yes check:

- Reply packets going or not? if going, check Router reverse routes.

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- Networking Config

- Interface check? correct ip on correct interface?

- Host Level Networking in GCP/VMWare

If Yes check:

- Firewall blocking traffic for port 22?

- Firewall blocking all external traffic?

- Host Level Firewall dropping SSH traffic?

;SSH Config File:

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ssh: connect to host 192.168.1.51 port 22: No route to host

;Wrong Port:

;Wrong Port OR SSH Not installed (TCP Reset is sent)

ssh: connect to host 192.168.1.50 port 2222: Connection refused

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tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN

;Check Service logs:

;Journalctl:

journalctl -xe

;SSH Version:

telnet 192.168.1.50 22

Trying 192.168.1.50...

Connected to 192.168.1.50.

Escape character is '^]'.

SSH-2.0-OpenSSH_8.0p1 Ubuntu-6build1

== System Design ==