Re: [FW-1] Firewall dropping packets

Sat, 24 Dec 2005 07:59:52 -0800

Yeah, it's a weird message for sure. "tried to open a known service port" - Near as I can figure, if you have a service defined as using a specific port, something trying to connect to that port will trip this block. It may have been a relevant defense tactic when firewalls only had a few ports defined, but it sure causes problems now for everything above 1023.
We hit it when we were using Outlook through FW-1. It uses random high ports to communicate with Exchange. We would keep seeing this drop intermittently in the logs when Outlook picked a random port that was defined as a service on the firewall. 


I suspect Lindsay is correct; this is a protection that got moved into 
SmartDefense when it originally wasn't there.


Ray


From: Lindsay Hill <[EMAIL PROTECTED]>

Reply-To: Mailing list for discussion of Firewall-1              
<[email protected]>

To: [email protected]
Subject: Re: [FW-1] Firewall dropping packets
Date: Fri, 23 Dec 2005 17:26:13 +0000


Doesn't matter what your logs say they were generated by, Ray's  solution 
is the correct one. It is SmartDefense. It may not say that,  since that 
particular protection/setting has been around for a while,  possibly (can't 
quite remember) from before SmartDefense was called  that.



On 23 Dec 2005, at 13:15, Tauseef Khan wrote:


Thanks Ray

That's definitely helped, but quite surprisingly these logs weren't
generated by smartdefense, rather they were generated by  VPN1&Firewall1.
Any ideas.

Kind regards
Tauseef

-----Original Message-----
From: Mailing list for discussion of Firewall-1
[mailto:[EMAIL PROTECTED] On Behalf Of Ray
Sent: 22 December 2005 19:33
To: [email protected]
Subject: Re: [FW-1] Firewall dropping packets


It's a SmartDefense drop. You have to change SmartDefense to allow
connections to all ports,

Network Security
Dynamic Ports
Select the top radio button

Ray


From: Tauseef Khan <[EMAIL PROTECTED]>
Reply-To: Mailing list for discussion of Firewall-1
<[email protected]>
To: [email protected]
Subject: [FW-1] Firewall dropping packets
Date: Thu, 22 Dec 2005 15:45:48 -0000

I am getting the following error message in the firewall logs with no
rule number against that.  Any ideas.

"reason: tried to open a known service port,;protocol:tcp; port_svc:
ICKiller"


Kind regrads



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