Solved

Firewall reporting a SYN attack

Posted on 2013-01-29
7
247 Views
Last Modified: 2013-02-25
We have a single sbs2011 server running exchange with AVG, and we noticed that everything, particulalry our internet service is running slowly. On checking our Firewall logs we noticed that it is reporting a SYN attack, which may explain the speed issues.

I dont know the first thing about this kind of attack, so could anyone please provide a step by step approach on how to deal with this?

Many thanks.
0
Comment
Question by:nigelbeatson
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
7 Comments
 
LVL 8

Expert Comment

by:R_Edwards
ID: 38830676
what type of firewall are you using?
0
 

Author Comment

by:nigelbeatson
ID: 38831016
it is a Cisco ASDM 6.2(1)
0
 
LVL 8

Accepted Solution

by:
R_Edwards earned 500 total points
ID: 38831416
can you post part of the log that shows the SYN attack?
0
Forrester Webinar: xMatters Delivers 261% ROI

Guest speaker Dean Davison, Forrester Principal Consultant, explains how a Fortune 500 communication company using xMatters found these results: Achieved a 261% ROI, Experienced $753,280 in net present value benefits over 3 years and Reduced MTTR by 91% for tier 1 incidents.

 

Author Comment

by:nigelbeatson
ID: 38888492
On site today, and will try to provide the requested info.

Many thanks.
0
 

Author Comment

by:nigelbeatson
ID: 38924794
Problem appears to have resolved itself? Ie no further problems have been encountered.

Many thanks
0
 
LVL 8

Expert Comment

by:R_Edwards
ID: 38925599
good to hear.
0
 

Author Closing Comment

by:nigelbeatson
ID: 38925608
Thanks for your assistance
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Disable Email Signatures via GPO 25 255
SBS Server and Office 365 5 62
WSUS 3.0 SP2 Replicate to WSUS 2016 3 109
DNS issues after a power outage 3 87
The SBS 2011 release date (RTM) is supposed to be around Christmas, 2011.  This article is a compilation of my notes -- things I have learned first hand.  The items are in a rather random order, but I think this list covers most of what is new and d…
I've often see, or have been asked, the question about the difference between the Exchange 2010 SP1 version, available as part of Small Business Server (SBS) 2011, and the “normal” Exchange 2010 SP1 Standard. The answer to the question is relativ…
How to Install VMware Tools in Red Hat Enterprise Linux 6.4 (RHEL 6.4) Step-by-Step Tutorial

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question