IBM Support

Unable to SSH to one of PDA host servers with error message "No route to host"

Troubleshooting


Problem

User can't SSH to one of host servers by either hostname or IP address.

Symptom

When user SSH to PDA host server, it shows following error message:
# ssh netezza2
ssh: connect to host netezza1 port 22: No route to host

User cannot get the ping response either.

# ping prodnzbb


PING netezza2.ibm.com (xxx.xxx.xxx.xxx) 56(84) bytes of data.
From netezza2.ibm.com (xxx.xxx.xxx.xxx) icmp_seq=1 Destination Host Unreachable

However, user can SSH or ping the PDA host server by the internal network.


# ping ha2
PING ha2 (10.0.0.3) 56(84) bytes of data.
64 bytes from ha2 (10.0.0.3): icmp_seq=1 ttl=64 time=0.191 ms

Resolving The Problem

1. Check the outbound Ethernet Interface by using ethtool to make sure links are detected.

2. Check the route to host server by using tracepath or traceroute commands

3. If the result of tracepath or traceroute shows that host server is unreachable, check the /etc/hosts if the IP addresses of host servers are correct.

[{"Product":{"code":"SSULQD","label":"IBM PureData System"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Component":"Host","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"1.0.0","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
17 October 2019

UID

swg21903598

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