We randomly seem to get some alerts that say:
SYSTEM ALERT : high : error: Key exchange failed in SSH handshake - DH key
I'm new to Palo Alto firewalls and was just curious if this is something that can be ignored? Was thinking that this might be the result of just some networking issue this to fail and generate this alert.
Do you have SSH enabled on the external interface of this PAN firewall. Is there any threat logs on this PAN FW Monitor > Logs > Threat.?
I'm going to assume SSH is enabled.
On our External interface the management profile is: Allow_ping_ssh_https
As far as threat logs, I don't see any for SSH in our current logset which does not go as far back as when these SSH Handshake logs were noticed.
It seems that this alert was generated because of a failed attempt to gain access to the device via SSH. If you think, someone is trying to get unauthorized access on your device, you may configure "permitted IP Addresses" list on your PAN firewall.
Hope this helps.
I tried to reproduce this error, but wasnt successful in any configuration scenario.
Do you have accessive SSH attempts on firewall, this kind of error comes in DOS scenario.
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