for starters, I can even find the Encryption Alert that you are talking
about :-)
I went straight to packet 44 and don't see it anywhere. I did a search
for the word "alert" in the whole trace and didn't find it either. How
did you find that?
Great catch on the ACK flag not being set in frame 50, also if you look
at the ACK itself, it doesn't match any SEQ numbers of my client. I
don't have any IPS device in the mix. My client goes through a Pix
firewall to a dmz where the proxy server is.
I really appreciate you thinking this through with me.
jack
-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx
[mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Sake Blok
Sent: Sunday, April 13, 2008 12:03 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] Same SEQ number but different ACKs
On Sun, Apr 13, 2008 at 04:07:42PM +0200, Sake Blok wrote:
> On Sun, Apr 13, 2008 at 09:27:41AM -0400, Sheahan, John wrote:
> > this is actually code that runs on several servers that exchanges
> > XML data over HTTPS using the proxy. I didn't see the Encrypted
> > Alert but I'm going to recheck for that. I have enclosed the trace
> > of one conversation.
>
[...]
> frame 50: Proxy sees data *after* the client has acknowledged the TCP
> session teardown (ACK=23504 in frame 47) and sends RST
I just remembered your comment about the high ACK number for the RST
packet and took another look at it. Frame 50 also doesn't have the ACK
flag set. This is also not according to RFC and indeed it does have a
sequence number that does not belong to this tcp session.
Are you sure it's the proxy that sent this packet? Couldn't it have been
an Intrusion Detection and Prevention System (IDP) that generated this
packet?
Cheers,
Sake
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