failed to fetch host key - previously used hostname

[pmerlitt]

All,

I'm trying to add a device to NSO, see below.  NOTE: I have used this hostname and IP address before and rebuilt the device and device config in NSO from scratch.  Do I have to delete the hostkey in NSO somehow?  Also know, I can ssh from the ubuntu server running NSO to the device just fine (after deleting the hostkey in Ubuntu, of course).

nsoadmin@ncs(config)# do show running-config devices device ACCESS1

devices device ACCESS1

address   172.20.1.2

authgroup BOOTSTRAP

device-type netconf ned-id netconf

state admin-state unlocked

!

nsoadmin@ncs(config)# devices fetch-ssh-host-keys device [ ACCESS1 ]

fetch-result {

    device ACCESS1

    result failed

    info Failed to connect to device ACCESS1: connection refused

}

[RichardD2]

Maybe regenerate the keys like is explained in a previous post 

https://community.cisco.com/t5/nso-developer-hub-blogs/collective-intelligence-resolved-my-ssh-problems-with-nso-on-the/ba-p/3765959

[vleijon · Accepted solution]

Connection refused seems like either the address/port is wrong or the device is down. Verify that you can ssh from a shell on the NSO machine to the address/port combination that you use.

[pmerlitt · Accepted solution]

UGGG!!!!! Your comment made me realize I changed the ned to netconf, port 830!!! I was testing SSH port 22 which was working fine... When I tested NETCONF connectivity to the device, it was NOT working.  Some quick troubleshooting on the device and all is good now.  Thank you for you comment!