Log Question - Key Exchange

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L1 Bithead

Log Question - Key Exchange

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.

L7 Applicator

Re: Log Question - Key Exchange

Hello,

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.?

Thanks

L1 Bithead

Re: Log Question - Key Exchange

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.

L7 Applicator

Re: Log Question - Key Exchange

Hello

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.

permitted-list.jpg

Hope this helps.

Thanks

L1 Bithead

Re: Log Question - Key Exchange

Ok thank you. That is what I was looking for.

Thanks for the help.

L6 Presenter

Re: Log Question - Key Exchange

Hi Mathrew,

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.

Regards,

Hardik Shah

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