Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Weird Cisco / Port 80 Web Site Access Issue

Posted on 2006-10-23
4
Medium Priority
?
340 Views
Last Modified: 2007-02-13
Fairly simple configuration, Westell DSL modem, and Cisco 1811W integrated services router configured with BVI interface and Dialer0 interface for DSL connection.

As of last night, did some DSL modem troubleshooting (changed DSL modem from "router" mode to "bridged ethernet" mode), and now client can browse any web site on the internet EXCEPT for Yahoo, and their web site hosted by Yahoo.

On the client PC I can telnet to Port 80 on Yahoo.com and get a connection, and in Internet Explorer, for a split second, displays the page title in the title bar of the browser, then suddenly stops and displays "Cannot find server or DNS error".

This makes absolutely no sense to me. Suggestions? Urgent. :(
0
Comment
Question by:BrandonPotter
4 Comments
 
LVL 9

Assisted Solution

by:crawfordits
crawfordits earned 400 total points
ID: 17789687
Review the hosts file located in c:\windows\system32\drivers\etc.  Should look like this:

# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
#      102.54.94.97     rhino.acme.com          # source server
#       38.25.63.10     x.acme.com              # x client host

127.0.0.1       localhost
0
 
LVL 7

Assisted Solution

by:Yves Accad
Yves Accad earned 400 total points
ID: 17791784
Does this happen on all local machines?
Does it only happen in IE?
Please for testing purpouses, install firefox: http://www.mozilla.com/en-US/firefox/
Do you have the same issues with firefox?
0
 
LVL 1

Accepted Solution

by:
rpone605 earned 1200 total points
ID: 17806402
You might want to check the MTU settings on both the cisco and westel devices.
0
 

Author Comment

by:BrandonPotter
ID: 17806452
OK, tried all of the above comments, and stumbled upon the solution:

Apparently somewhere in the process of establishing the Dialer0 interface through Switch Device Manager, the "Inspect nonstandard HTTP traffic" was checked, with a policy action of "Drop".

Cleared this and all was well. However, unchecked "Inspect HTTPS traffic" and then HTTPS did not work at all. Weird, just checked it back and HTTPS is not blocked anymore.

Interesting Cisco animal, the 1811W + SDM.
0

Featured Post

Restore individual SQL databases with ease

Veeam Explorer for Microsoft SQL Server delivers an easy-to-use, wizard-driven interface for restoring your databases from a backup. No expert SQL background required. Web interface provides a complete view of all available SQL databases to simplify the recovery of lost database

Question has a verified solution.

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

Originally, this post was published on Monitis Blog, you can check it here . It goes without saying that technology has transformed society and the very nature of how we live, work, and communicate in ways that would’ve been incomprehensible 5 ye…
Sometimes clients can lose connectivity with the Lotus Notes Domino Server, but there's not always an obvious answer as to why it happens.   Read this article to follow one of the first experiences I had with Lotus Notes on a client's machine, my…
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…
There's a multitude of different network monitoring solutions out there, and you're probably wondering what makes NetCrunch so special. It's completely agentless, but does let you create an agent, if you desire. It offers powerful scalability …

580 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