Re: Need Help Reading Capture

[<Tim.Poth () bentley com>]

Hi Chris,
I assume publicip is the sonicwall? I don't see a reset going to the sonicwall in what you have here, but then there 
are other unseen things so maybe the snip is too small?
The device that generated the reset is listed in the source column so the reset in frame 66 is sent by .4 to .3 BUT it 
seems like the reset is in response to a FIN ACK from .3 (frame 64). I have no way of knowing if the activity in frames 
64 / 66 are related to frame 60 ~ 63. (I guess no but...) IF it is related than I would think there is something amiss 
with the SSL handshake, you could try to turn off SSL and see if the problem goes away or check out the logs on .3. As 
I don't see a reset going to publicip it could be the reset is not happening on your network but rather on the 
internet. Again this could go back to a SSL handshake issue and it could be the client resetting the connection. It 
could be frame 66 isnt the reset your looking for.
Hope that helps
tim

-----Original Message-----
From: wireshark-users-bounces () wireshark org [mailto:wireshark-users-bounces () wireshark org] On Behalf Of Chris 
Arnold
Sent: Monday, February 11, 2013 4:47 PM
To: wireshark-users () wireshark org
Subject: [Wireshark-users] Need Help Reading Capture

Hello all! New to the list and wireshark. I am having problems with a client connection from the internet (my sonicwall 
tells me:
02/11/2013 14:11:29.576 Debug Network TCP connection abort received; TCP connection dropped 8.25.230.32, 49333, WAN 
192.168.123.3, 443, LAN TCP Flag(s): ACK RST). So i ran wireshark and captured https traffic. I need help in 
determining which device (pc or sonicwall) is generating ACK RST. Can someone help me do that? Here is the start of the 
trouble connection and line 66 is the RST:

57      12.403536       pu.bl.ic.ip     192.168.123.3   TCP     49386 > https [SYN] Seq=0 Win=8192 Len=0 MSS=1332 WS=8 
SACK_PERM=1 
58      12.403560       192.168.123.3   pu.bl.ic.ip     TCP     https > 49386 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 
MSS=1460 SACK_PERM=1 WS=6
59      12.448002       pu.bl.ic.ip     192.168.123.3   TCP     49386 > https [ACK] Seq=1 Ack=1 Win=66560 Len=0
60      12.448387       pu.bl.ic.ip     192.168.123.3   TLSv1   Client Hello
61      12.448409       192.168.123.3   pu.bl.ic.ip     TCP     https > 49386 [ACK] Seq=1 Ack=149 Win=15680 Len=0
62      12.448795       192.168.123.3   pu.bl.ic.ip     TLSv1   Server Hello, Change Cipher Spec, Encrypted Handshake 
Message
63      12.496943       pu.bl.ic.ip     192.168.123.3   TLSv1   Change Cipher Spec, Encrypted Handshake Message, 
Application Data
64      12.497212       192.168.123.3   192.168.123.4   TCP     47533 > https [FIN, ACK] Seq=1 Ack=1 Win=364 Len=0 
TSV=73368246 TSER=1862090175
65      12.497255       192.168.123.3   192.168.123.4   TCP     47715 > https [SYN] Seq=0 Win=14600 Len=0 MSS=1460 
SACK_PERM=1 TSV=73368246 TSER=0 WS=6
66      12.497404       192.168.123.4   192.168.123.3   TCP     HTTPS > 47533 [RST] SEQ=1 WIN=0 LEN=0
67      12.497430       192.168.123.4   192.168.123.3   TCP     https > 47715 [SYN, ACK] Seq=0 Ack=1 Win=14480 Len=0 
MSS=1460 SACK_PERM=1 TSV=1863224474 TSER=73368246 WS=6

Basically whats happening here is a connection from the internet to the sonicwall. Sonicwall passes to 192.168.123.3 
and 192.168.123.3 proxies to 192.168.123.4.

My question is how do i find out what device is generating the ACK RST (line 66)?
I would be happy to send the complete log for further inspection.
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