It is important to regularly change host keys. it is a complicated process and has to be done with due diligence. host certificates. some ssh implementations support using certificates for authenticating hosts. tools for ssh host key management.. The ssh host key is used to distinguish monitored hosts, there should not be duplicate ssh keys. a key can be duplicated if a server is cloned. this section describes how to change the ssh host key for a particular host, eliminating the events and alarms generated when duplicate hosts are detected.. Shortly thereafter, i am kicked off of my ssh connection. i try to ssh in - the connection can't be established. a while later i try to ssh in - the host key has changed. i accept the change and try to log in but i get "access denied" in response to my password. a while later, i am able to ssh into the machine again..
Ssh rsa host key changed after a review of our security practices brought on by the recent debian ssh key security issue (which does not affect our freebsd-based service), we’ve decided to upgrade the strength of our rsa ssh host key from 1024 bits to the same length that we recommend you use, 4096 bits.. Hostkey /etc/ssh/ssh_host_ecdsa_key i noticed i was getting a lot of similar but varying errors trying to connect to the box starting then, such as: "the rsa host key for %hostname% has changed, and the key for the corresponding ip address %ipaddress% is unchanged.". The ssh host key is used to distinguish monitored hosts, there should not be duplicate ssh keys. a key can be duplicated if a server is cloned. this section describes how to change the ssh host key for a particular host, eliminating the events and alarms generated when duplicate hosts are detected..