Solved

possible intruder alert

Posted on 2003-12-11
7
252 Views
Last Modified: 2010-04-11
I have my cisco set up and my router keeps denying a call on port 135. Can anyone tell me what this is or help me research this.

Thanks, Troy
0
Comment
Question by:troyd1
7 Comments
 
LVL 19

Accepted Solution

by:
Dexstar earned 25 total points
ID: 9925045
@troyd1:

> Can anyone tell me what this is or help me research this.

Port 135 is used by Microsoft for RPC.  Read all about it:
http://nsit.uchicago.edu/alert/port-135.html

Hope That Helps,
Dex*
0
 
LVL 18

Assisted Solution

by:chicagoan
chicagoan earned 25 total points
ID: 9925525
0
 
LVL 79

Expert Comment

by:lrmoore
ID: 9928046
A router can only deny what it is told to. Do you have any access-lists?
Perhaps the ISP is blocking tcp 135 further upstream. This is a recent phenomenon since the outbreak of MSBlast and Welchia worms.

0
Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

 

Expert Comment

by:brianrance
ID: 9928693
Sounds like Welchia or Blaster or one of the other RPC exploiters are knocking.  Luckily, you have a firewall.  I recommend you leave 135 blocked.  And find out the source of the requests (there should be an associated IP Address).  Report this IP address to your ISP and ask them to investigate it, as the source Host may be infected with a Virus/Worm.

And remember, the triad of virus protection:
1. Firewall
2. Up To Date Antivirus Software
3. Latest Operating System patches and fixes whether they be MS, *nix, or Mac
0
 
LVL 18

Expert Comment

by:chicagoan
ID: 9928854
If it ticks you off that you're being probed, take a look at http://www.dshield.org/fightback.php
There some good info about security there as well.
0
 

Expert Comment

by:brianrance
ID: 9928895
oh, and listen to Irmoore.  If you take a look to the right, at that list of the Top 15 Experts...
0
 

Author Comment

by:troyd1
ID: 9930057
Thanks for all the info. This was all good info.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Some time ago I was asked to set up a web portal PC to put at our entrance. When customers arrive, they could see a webpage 'promoting' our company. So I tried to set up a windows 7 PC as a kiosk PC.......... I will spare you all the annoyances I…
Most of the applications these days are on Cloud. Cloud is ubiquitous with many service providers in the market. Since it has many benefits such as cost reduction, software updates, remote access, disaster recovery and much more.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

896 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

16 Experts available now in Live!

Get 1:1 Help Now