Weird Loss of Connectivity Issue -- Help? - Connectivity

This is a discussion on Weird Loss of Connectivity Issue -- Help? - Connectivity ; Hi, I'm on a cable connection, running through a Linksys Cable Gateway. I cannot connect to the Internet via web browser, but can connect in every other way (ping, Usenet, E-mail, etc....). But here's the rub: I use a Cisco ...

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Thread: Weird Loss of Connectivity Issue -- Help?

  1. Weird Loss of Connectivity Issue -- Help?

    Hi,

    I'm on a cable connection, running through a Linksys Cable Gateway.

    I cannot connect to the Internet via web browser, but can connect in every
    other way (ping, Usenet, E-mail, etc....).

    But here's the rub: I use a Cisco VPN client to connect to my office
    servers. When the VPN client is installed on my machine (no vpn connection
    initiated, just the client installed) I can usually browse normally. If I
    lose my browsing ability, initiating a VPN connection restores it, and
    keeps it restored for some time AFTER I drop the VPN connection.

    If I uninstall the Cisco VPN client, I lose all browser connectivity (but
    all other connectivity remains fine).

    It's not a DNS problem, because I can't reach sites via straight IP.
    Indeed, I can't even connect to my Linksys Gateway via browser.

    Any ideas would be appreciated.

    Thanks,
    Kyle

  2. Re: Weird Loss of Connectivity Issue -- Help?

    What are the proxy settings in your browser? In order to tunnel through your
    vpn to a secure intranet (presumably a web front end), chances are that your
    browser is set up to use a proxy server located somewhere on the network you
    are tunneling into. This would explain why you can browse while the vpn is
    connected but usually NOT when it is disconnected (I'm not sure why you can
    browse immediately after disconnecting from the VPN -- however you may
    actually be pulling up pages cached locally).

    This could also explain why you can do other internet tasks that don't use
    the browser's proxy settings. Take a look at proxy settings and turn the
    proxy off (uncheck the applicable boxes) while browsing with VPN
    disconnected. Don't erase the settings, as you will most likely need them
    (and, hence, need to enable them again) when you are on the VPN.

    To locate the proxy settings in Internet Explorer go to Internet options -->
    "Connections" Tab --> LAN Settings. Generally, I like to disable all proxy
    settings, including the automatic ones. On the bottom half of the "LAN
    Settings" Dialogue box you will most likely find where the actual proxy
    server used by your network is specified.

    In addition to frequent usage in VPNs, proxy settings may automatically be
    configured in your browser by software supplied from your ISP, anonymous
    browsing software, and some antivirus or software firewalls -- not to
    mention some malware programs (viruses and spyware, obviously for malicious
    purposes), etc. If you do have proxy settings enabled in your browser, and
    you can establish (through your IT department at work) that the VPN and the
    applications that use it do not require a proxy server, I recommend leaving
    all proxy settings disabled.

    Another possibility is that your problem might stem from an improperly
    configured NAT Firewall (router) installed on your local network or a
    software firewall installed on your system. This is not likely, because if
    it were the source of your browsing issues, you would not likely be able to
    browse at all. It's also possible that you have a firewall that is
    configured (most likely on purpose by someone knowlegable on your IT staff)
    to reject all web traffic that doesn't pass through your VPN. Again, this is
    not likely because if it were intentionally configured this way, it would
    most likely block all traffic, not just web traffic.



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