Google: Difference between revisions

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 == SSH to remote server ==
+;GCP VM SSH Connection Timed out
- GCP VM
+ SSH Packets are reaching Destination? TCPDump on Destination. If not check:
- Timed out
+   - IP Correct
+   - DNS Correct
+   - Port Correct
+ If yes check:
+   - Reply packets going or not? if going, check Router reverse routes.
+   - IPTables Rejecting packets (Flush IPTabeles -F)
+   - Packets received on correct interface? (SSH might be listening on wrong port - ListenAddress )
+ Any traffic reaching Server? If not check:
-SSH Config File:
+   - Networking Config
+   - Interface check? correct ip on correct interface?
+ If Yes check:
+   - Firewall blocking traffic for port 22?
+   - Firewall blocking all external traffic?
+;SSH Config File:
  /etc/ssh/sshd_config      # sshd server configuration file
  Port 22
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  /etc/ssh/sshd_config      # ssh client configuration file
-Restart SSHD:
+;Restart SSHD:
  sudo systemctl restart sshd.service
  sudo systemctl status sshd.service
-Wrong IP:
+;Wrong IP:
  ssh: connect to host 192.168.1.51 port 22: No route to host
-Wrong Port:
+;Wrong Port:
  ssh: connect to host 192.168.1.50 port 2222: Connection refused
-Netstat:
+;Netstat:
  netstat -ant | grep 22
  tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN
-Journalctl:
+;Journalctl:
  journalctl -xe