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This Host Has The Same Public Key As Host

Symptom


I have a strange problem. I am setting a backup of a new machine, but when I do "Host Discovery" I get the error message "This host has the same public key as w.x.y.z", while w.x.y.z is another machine that is being quite happily backed up at present on regular basis. What can I do to change this host key? 

Cause


The agent installation was copied form one server to another. The private key checking makes sure every agent has a unique RSA key and we check it which is critical for your security.

Resolution


Uninstall the agent on machine w/ duplicate key error and reinstall.

Related Articles


Page: Backup Fails with "AGENT Dropping Connection from Unknown Remote Host" (Archived Knowledge Base 2.0) Labels: host_discovery
Page: This Host Has The Same Public Key As Host (Archived Knowledge Base 2.0) Labels: host_discovery, public_key
Page: Same Public Key Is Found (Archived Knowledge Base 2.0) Labels: host_discovery, public_key, upgrade
Page: Troubleshooting Your Host (Agent) To CDP Network Communications (Archived Knowledge Base 2.0) Labels: host_discovery, firewall
Page: This Host Has The Same Public Key As Host (Archived Knowledge Base 2.0) Labels: host_discovery, public_key
Page: Same Public Key Is Found (Archived Knowledge Base 2.0) Labels: host_discovery, public_key, upgrade
Labels:
host_discovery host_discovery Delete
public_key public_key Delete
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