Internet connection is intermittent, in an enterprise network

Posted on 2006-04-18
Last Modified: 2010-04-18
We are a small company with one router, one firewall, 7 servers (all run winows server 2003...we also have an exchange server--doing our users' email in house), and 110 desktop users ( all are win2000 or xp)...and at a specefic date (9 days ago), the internet connection has been really flakey.  Some users (about 10%) use their pc to connect remotely to data on servers hundreds of miles away, and most users (maybe 90% ...PLUS the 10% remote users) use various office applications --and all use their internet browsers to accomplish the majority of their work. Even the intranet applications are "showing" the
similar errors. When users can't connect, usually the browser (ie v 6) says "socket error", or sometimes the remote users' connection dis-connects, and they often can't re-connect (automatically or manually).

Things we've found out:
IF we go into the user's browsers (tools/internet options/connections the lan settings button), and click the proxy server is better...but all are still
un-connecting intermittently. We neverused to  have needed that "use a proxy server for your lan" checkbox checked.

There was a lightening storm last weekend...all problems appeared after that storm.

The users that login remotely to the offsite servers were the first to report the error. We contacted the sys admin dude there---and he said we are the only ones reporting any such connection errors. This sys admin says it looks like it could be our ISP...who we've contacted (not much help there).

We have reset the router (power cycled it), and re-configured the firewall (flashed it)...and checked all functions on the servers that we have.

Email seems mostly unaffected, although several users have the connection to our mail server conk out, lock up, or quit. . . but just for a couple of minutes.

Most of the errors show up on the browser connections.

Any ideas ? Thank you!

Question by:TeamMISCBC
    LVL 23

    Accepted Solution

    I would start by checking the firewall and router for logs and see if there are errors reported in them.

    It's possible if your building and equipment isn't grounded properly that either the router or the firewall got screwed up.

    You'll need to try to determine which one it was (again by reviewing the logs on each).

    If you are saying though that the internal users have problems connecting to internal resources as well (Exchange), then I would also check whatever LAN switches you are using for errors too.
    LVL 51

    Expert Comment

    I suspect the switch between the router and the LAN is hurting.  Lightning is nasty.  I lost 2 NICs in 2 different servers one night - now I protect everything.


    Featured Post

    Courses: Start Training Online With Pros, Today

    Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

    Join & Write a Comment

    It is a known fact that servers reach the end of their lives. Some get there quicker than others, based on age, manufacturer, usage and several other factors. However, if your organization has spent time deploying Microsoft's Active Directory server…
    Setting up a Microsoft WSUS update system is free relatively speaking if you have hard disk space and processor capacity.   However, WSUS can be a blessing and a curse. For example, there is nothing worse than approving updates and they just have…
    how to add IIS SMTP to handle application/Scanner relays into office 365.
    This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.

    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

    19 Experts available now in Live!

    Get 1:1 Help Now