Re: Port number query - help needed

From: sponge (yosponge_at_yahoo.com)
Date: 12/27/03 

Date: 27 Dec 2003 14:21:07 -0800

On Sat, 27 Dec 2003 17:59:18 GMT, Anon <anon@nameless.pdf> wrote:

>In article <3fed96f6$0$25978$fa0fcedb@lovejoy.zen.co.uk>,
>neilhindry@_nospamthankyou_ntlworld.com says...
>> I have a desktop PC running Win ME and Kerio personal firewall
2.1.5 I have
>> setup all the rules I need and they all seem to be doing their job.
As I
>> knew
>> they were working I saved the rules to disk and then imported them
onto my
>> laptop PC. My laptop PC runs Win XP Pro.
>> Now when I try to send e-mail from Outlook Express it needs Port
1027 adding
>> to the list of ports. I use Outlook Express on my desktop and it
didn't need
>> this port. The only difference is the firewall used. On desktop I
use AVG
>> and Norton on laptop.
>>
>> Why would this port be needed on my laptop but not on my desktop?
Could it
>> be to do with Norton Anti-Virus
>>
>> Could I have a virus, worm or Trojan or is this normal?
>>
>> I hope someone can help and I appreciate any help given.
>>
>> Thanks!!
>>
>>
>>
>Hi Neal. From your description: On Win Me machine you are running
>Outlook express and Kerio firewall. On the XP machine you are
>running Outlook Express and I suppose the XP firewall.
>It appears to me that you may have a Local Port firewall rule problem
>on the laptop maching and maybe on the Win ME machine, too.
>On my Win 98, my browser, mail client, and news reader connect to
>Remote Ports 80,443/110,25/and 119 (plus others). All of these
>connections leave my machine on random Local Port numbers in the
>range from 1025 to possibly 1200. I would suggest you set the rules
>in each machine to allow this range of Local Ports. Let us know
>if that helps.

Almost right. Most "client-side" applications will use any LOCAL PORT
in the range from 1024 to 5000, incrementing by one for each new
connection and rolling over at 5000. You just may not surf long enough
to get that high. I rarely get beyond 2400 myself.

Email programs like Outlook should be allowed to talk to Port 25, 110,
and 443 REMOTE, and ports 1024-5000 LOCAL. Protocol is TCP, and
direction is OUTGOING. You can tighten things up a bit by finding out
the IP address of your POP and SMTP servers an setting only that IP
address in the Remote Endpoint field. (This may require two rules if
the SMTP and POP server are different.)

Browsers normally should be allowed LOCAL PORT 1024-5000, REMOTE PORTS
80, 8080, and 443, and IP address, Protcol TCP & UDP. If you use a
browser with built-in email and news, (like Mozilla or Opera - hint,
hint, hint don;t use IE or Outlook!) you can combine the above rule
with this one so your REMOTE PORTS are 25, 80, 110, 443, 8080 and just
allow any IP address.

There is a generic how-to at www.pcflank.com or a more detailed how to
at my site, www.geocities.com/yosponge/fw/fwmain.html

Sponge
Sponge's Secure Solutions
www.geocities.com/yosponge
My new email: yosponge2 att yahoo dott com

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