Solved

possible intruder alert

Posted on 2003-12-11
7
254 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
Connect further...control easier

With the ATEN CE624, you can now enjoy a high-quality visual experience powered by HDBaseT technology and the convenience of a single Cat6 cable to transmit uncompressed video with zero latency and multi-streaming for dual-view applications where remote access is required.

 

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

VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.

Question has a verified solution.

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

Suggested Solutions

#Citrix #Citrix Netscaler #HTTP Compression #Load Balance
Join Greg Farro and Ethan Banks from Packet Pushers (http://packetpushers.net/podcast/podcasts/pq-show-93-smart-network-monitoring-paessler-sponsored/) and Greg Ross from Paessler (https://www.paessler.com/prtg) for a discussion about smart network …
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…

821 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