Solved

Exchange server sending strange traffic - UDP ports

Posted on 2009-07-09
5
536 Views
Last Modified: 2012-05-07
I am seeing some really strange things on my network.  According to my firewall logs, it looks as if my exchange server is attempting to connect to random IP addresses in the private network ranges that are outside of my internal private network ranges.  The only commonality is what ports the Exchange system is sending out on.  I see the traffic on port 1418, 1475, 1659, and a couple other ports.  The issue started towards the end last month, around the 25th if I am not mistaken.  As far as I am aware, there have been no updates or software packages recently installed on this system.  I cannot find any processes that would be causing these issues either.  My virus definitions are up to date, and there was a full system scan run this past Sunday without any issues found&  I have run WireShark on the Exchange server and I see the traffic in the packet capture.  I need to get this resolved ASAP.
0
Comment
Question by:warewols
  • 2
  • 2
5 Comments
 
LVL 12

Assisted Solution

by:marcustech
marcustech earned 400 total points
ID: 24813532
try run

netstat -b -v
to show the process that a creating the connections.

If that doesn't shed any light on the situation, post them here and I'll have a look for you.

Exchange shouldn't be making any UDP connections.
0
 
LVL 12

Assisted Solution

by:marcustech
marcustech earned 400 total points
ID: 24813535
(run that from CMD on the server - I forgot to mention)
0
 

Author Comment

by:warewols
ID: 24813754
I have attached the netstat command's output.  I am going through it myself right now...  Thanks for your help.
info.txt
0
 
LVL 2

Assisted Solution

by:TimMallery
TimMallery earned 100 total points
ID: 24822387
Are you using EMC Legato Software? Some of this traffic seems associated with that.
0
 

Accepted Solution

by:
warewols earned 0 total points
ID: 24823899
After talking to Microsoft last night, this is a normal operation of the email server.  The port that I was seeing is just an arbitrary port that was chosen on the server for email traffic, on the the servers chose 1418 (assigned to Timbuktu in the RFC listings) to start the store.exe process.  Store.exe picks a port by finding the next available open port that is above port number 1024.

The reason we are seeing the traffic appear in the logs is because of malformed packets coming from the clients attempting to connect to the email server.  We are seeing the traffic coming in on a valid IP address (internal and external) and then attempting to go out to a private IP address outside the range of the internal private IP addresses.  The tech from Microsoft stated that these malformed packets could be coming from anywhere that has a NAT translation in place.  Some of the packets we inspected that were going to the unusual IP addresses showed MAC addresses for AirPort wireless APs, a Sonic firewall, and also a LINKSYS router.
0

Featured Post

Are end users causing IT problems again?

You’ve taken the time to design and update all your end user’s email signatures, only to find out they’re messing up the HTML, changing the font and ruining the imagery. What can you do to prevent this? Find out how you can save your signatures from end users today.

Join & Write a Comment

Following basic email etiquette rules will help you write a professional email and achieve a good, lasting impression with your contacts.
Scam emails are a huge burden for many businesses. Spotting one is not always easy. Follow our tips to identify if an email you receive is a scam.
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…
This video discusses moving either the default database or any database to a new volume.

746 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

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now