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SSH key mismatch

dciprus
Cisco Employee
Cisco Employee

After the upgrade of NSO and NED we're seeing this error from time to time when trying to communicate with devices.

NCS 5.7.8, NED: cisco-iosxr-cli-7.43.5

Obviously after disconnecting, connecting again and fetching keys, things are back to normal however issue seems to re-appear again after some time. Clues ? Ideas ?
Thanks !

admin@ncs# show devices device DC*********-CS**-****01 active-settings 
active-settings connect-timeout 20
active-settings read-timeout 300
active-settings write-timeout 600
active-settings ssh-keep-alive interval 20
active-settings ssh-keep-alive count 3
active-settings ssh-algorithms public-key [ ssh-ed25519 ecdsa-sha2-nistp256 ecdsa-sha2-nistp384 ecdsa-sha2-nistp521 rsa-sha2-512 rsa-sha2-256 ]
active-settings ssh-algorithms kex [ curve25519-sha256 curve25519-sha256@libssh.org ecdh-sha2-nistp256 ecdh-sha2-nistp384 curve448-sha512 ecdh-sha2-nistp521 diffie-hellman-group15-sha512 diffie-hellman-group16-sha512 diffie-hellman-group14-sha256 diffie-hellman-group14-sha1 ]
active-settings ssh-algorithms mac [ AEAD_AES_128_GCM AEAD_AES_256_GCM hmac-sha2-512-etm@openssh.com hmac-sha2-256-etm@openssh.com hmac-sha2-512 hmac-sha2-256 hmac-sha1 ]
active-settings ssh-algorithms cipher [ aes128-gcm@openssh.com AEAD_AES_128_GCM chacha20-poly1305@openssh.com aes256-gcm@openssh.com AEAD_AES_256_GCM aes128-ctr aes192-ctr aes256-ctr ]
active-settings ssh-algorithms compression [ none zlib zlib@openssh.com ]
active-settings ssh-algorithms dh-group min-size 1024
active-settings ssh-algorithms dh-group preferred-size 2048
active-settings ssh-algorithms dh-group max-size 8192
active-settings ned-keep-alive count 3
active-settings connect-retries attempts 0
active-settings connect-retries timeout 3
active-settings trace        false
active-settings trace-output file
active-settings ned-settings use-junos-rollback false
active-settings commit-queue enabled-by-default false
active-settings session-limits max-sessions unlimited
active-settings session-pool idle-time 30
active-settings no-overwrite enabled-by-default false
active-settings lsa no-overwrite enabled-by-default false
active-settings out-of-sync-commit-behaviour reject
admin@ncs# 
2 Replies 2

rogaglia
Cisco Employee
Cisco Employee

Hi, when you say that it fixes by fetching the keys, are these different keys or replacing the old keys with the same information?

 

Nabsch
Spotlight
Spotlight

Hi,

 

Which error message did you get ? Which NSO version you were using before the upgrade?

Here a link that might help you