topic Re: Log Question - Key Exchange in General Topics

Log Question - Key Exchange

MatthewSmith — Tue, 18 Nov 2014 20:51:06 GMT

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.

Re: Log Question - Key Exchange

HULK — Tue, 18 Nov 2014 20:59:40 GMT

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

Re: Log Question - Key Exchange

MatthewSmith — Tue, 18 Nov 2014 21:06:56 GMT

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.

Re: Log Question - Key Exchange

HULK — Wed, 19 Nov 2014 04:37:02 GMT

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.

Hope this helps.

Thanks

Re: Log Question - Key Exchange

MatthewSmith — Wed, 19 Nov 2014 15:07:36 GMT

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

Thanks for the help.

Re: Log Question - Key Exchange

hshah — Wed, 19 Nov 2014 15:23:43 GMT

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