[TriLUG] accessing mail.trilug.org, port 993

[Tanner Lovelace]

Hi folks,

I just returned from out of town and after reading this though I 
should respond.

1. Jon said it already, but I'll reiterate.  Always use "traceroute
-I".  Standard
traceroute these days uses UDP and we filter out UDP in our firewall rules.
traceroute -I uses ICMP echo (also known as ping) which we allow.

2. Alan, is your DSL connection on kr4jb.dyndns.org?  If so, then I think
the problem is on your end.  From dargo I can "traceroute -I" all the way to
your host but on moya it fails at the very last step.  That, to me, indicates
that your system is trashing packets to/from 64.244.27.141.  Try checking
your syslogs.  If you're running iptables, it should log something when you
drop a packet.  Alternatively, turn off your firewall and see if that makes
things work.  

3. I can definitively say there is nothing on the trilug servers that would
drop packets from anyone.  In the past we have setup blacklists for
specific IPs on specific ports (mainly port 25) against hosts that
were attacking us, but those only stay active for a few days and 
non are active now.

Good luck.

Cheers,
Tanner


On Tue, 28 Dec 2004 12:16:17 -0500, Alan Porter <porter at trilug.org> wrote:
> 
> I noticed recently that I can not check my trilug mail from
> home, but I can from work.  I use the same laptop in both places.
> I thought it might be a problem with my own firewall, or perhaps
> a blocked port.  So I tried this test.
> 
> FROM WORK
> ---------
> "telnet mail.trilug.org 993" connects OK
> "telnet mail.trijug.org 993" connects OK   (note different server)
> 
> FROM HOME
> ---------
> "telnet mail.trilug.org 993" hangs
> "telnet mail.trijug.org 993" connects OK   (note different server)
> 
> It's not my mail client... I am using the same laptop.  It's
> not outbound port 993 being blocked.  It's not my firewall rules.
> 
> What could this be?
> 
> Alan
> 
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