Google: Difference between revisions
→SSH to remote server
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It not, is there any network disconnection/lantency/congestion?
SSH Packets are reaching Destination? TCPDump on Destination(look for initial TCP packets with the SYN flags). If not check:
- Using IP Correct in client side.
- DNS Correct? try host file entry or direct ip access
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- Routes in intermediate devices.
- Packets going out of Client? check dest trace. Iptables might hv blocked, or networking issue.
- Traceroute
- Do Ping & check ICMP Traffic reaching
If yes check:
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- IPTables Rejecting packets (Flush IPTabeles -F)
- Packets received on correct interface? (SSH might be listening on wrong port - ListenAddress )
- SSH from Server to localhost
Any traffic reaching Server? If not check:
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- Firewall blocking all external traffic?
- Host Level Firewall dropping SSH traffic?
- Do Ping & check ICMP Traffic reaching
;SSH Config File:
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sudo systemctl restart sshd.service
sudo systemctl status sshd.service
sudo service sshd status
;Wrong IP:
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Network Congestion, Broadcast Storm
Duplicate IPs configured in same LAN, check ARP table repeatedly
;Debug SSH Connection:
ssh -vvv user@host
== System Design ==
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