Not able to ssh access Active after config on mgmt interface on Passive standby

bighead8181 — Tue, 02 Mar 2021 11:09:49 GMT

We have a pair of PA-3220 running 9.1.6. We made a config change on the passive and now not able to access the active firewall.

Config was added to passive host where we added ssh ciphers / mac / host key to the mgmt interface. After the change we could access passive device (where the config was added) after a putty upgrade. We were not able to access the active host even though no config was added there using either old version putty or updated version.

HA seems to be working ok. Im able to access both devices via GUI. Firewalls have been flipped, active now has updated ssh config. Is there a way to update the ssh keys and transfer them accross to its corresponding pair?

# set deviceconfig system ssh ciphers mgmt aes256-ctr
# set deviceconfig system ssh ciphers mgmt aes256-gcm
# set deviceconfig system ssh default-hostkey mgmt key-type ECDSA 256
# set deviceconfig system ssh regenerate-hostkeys mgmt key-type ECDSA key-length 256
# set deviceconfig system ssh session-rekey mgmt interval 3600
# set deviceconfig system ssh mac mgmt hmac-sha2-256
# set deviceconfig system ssh mac mgmt hmac-sha2-512
# commit
# exit
> set ssh service-restart mgmt

# delete deviceconfig system ssh kex mgmt
# set deviceconfig system ssh kex mgmt ecdh-sha2-nistp521
# commit

# exit
> set ssh service-restart mgmt

Re: Not able to ssh access Active after config on mgmt interface on Passive standby

BPry — Tue, 02 Mar 2021 15:12:22 GMT

@bighead8181,

You're going to need to have actual console access to update the active firewall, which is why you should never change these settings without direct host access. Keys aren't shared in a HA setup, they exist as part of <deviceconfig/> and don't transfer between units.

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Not able to ssh access Active after config on mgmt interface on Passive standby

Re: Not able to ssh access Active after config on mgmt interface on Passive standby