• Creator
  • #2269761

    Running Cisco VPN client on a wireless connection


    by pnubull ·

    Hi, I’ve a secured wireless connection using D-link router. When I run cisco VPN client,
    it connects, but the internet connection is lost immediately (in 3 seconds). If I connect
    ethernet cable, VPN and internet connection
    works fine (no issue). NOTE: The “lost connection” happens for all wireless networks I tried (4 different places).

    It appears there is some conflict between
    wireless connection and Cisco VPN client connection. There should be some configuration
    setting on wireless router or VPN client which should fix this issue, but can’t figure it out.
    I tried disabling PPTP and changing MTU sizes, but no luck.

    Please help. Thanks very much.

    Some info:
    Windows XP Home SP2
    Cisco VPN client

All Answers

  • Author
    • #2536354


      by pnubull ·

      In reply to Running Cisco VPN client on a wireless connection


    • #2535674

      tried newer version of VPN client

      by pnubull ·

      In reply to Running Cisco VPN client on a wireless connection

      I uninstalled 4.6 client and installed, but gave the same issue.

      I think the error is due to this log msg on vpn client:

      3 20:04:02.828 03/05/07 Sev=Warning/3 CM/0xA3100027
      Adapter address changed from Current address(es):

      Any help is very much appreciated.


      • #2549749

        VPN client disconnection – not solved

        by hisaroj ·

        In reply to tried newer version of VPN client

        I have the same scenario what is being discussed in this forum. The only difference in log is:
        “Adapter address changed from Current address(es):”

        I have tried with all suggestions given in this forum, but still getting the same error – reason:422 Lost contact with network…

        I have Broadcom 802.11b/g WLAN Network Adapter
        VLAN Priority Support – Disabled

        If somebody can help, then it will be great.
        Thanks in advance.

    • #2526053

      Installed VPN client 5.0

      by kok004 ·

      In reply to Running Cisco VPN client on a wireless connection

      I had the same problem, the client connected but i lost ip connectivity. I have recently installed a Beta version of the Cisco VPN client version and this solved the problem for me.

    • #2531171

      Having same problem using ver.

      by jgreene ·

      In reply to Running Cisco VPN client on a wireless connection

      I have an established VPN connection from my home XP Pro box to work, but just as in this original post, I cannot access the internet while the VPN is connected. My home box has a wireless connection to the internet through a D-link router. One other post claimed that upgrading the cisco client to ver. solved their problem, but I’m using, and I’m having the problem. I’m going to try hooking up an ethernet cable tonight, but does anyone have any ideas as to how to fix this problem, and if it is truly due to the wireless nature of the internet connection? Thanks.

      • #2523098

        Could be a Broadcom driver problem

        by sknobloc ·

        In reply to Having same problem using ver.

        I had the same problem. I finally found out that Broadcom didn’t exactly follow the standards on their wireless card (I have a HP NX9600). I ended up rolling back the driver to a 2003 version and it now works flawlessly. Hope this helps others out there.


        • #2603332

          Disable VLAN Priority Support-Worked for my users

          by m.madden ·

          In reply to Could be a Broadcom driver problem

          I have also been plagued by this exact issue for a year or more. Mainly as it resolved and reappeared with no reason and no definitive fix. I’ve had at least 20 users at my office experience this issue with no solutions to be found in internet searches.
          The scenario is the same as most others here have described.
          A user has a good connection to the internet via a wireless connection at home. They can successfully connect and authenticate to their company VPN via Cisco VPN client. But then no other traffic will flow (no internet, intranet, email icmp, etc). If they connect via wired connection everything works fine.

          This does not affect everybody and usually only happens at home (works fine at a hotel or hotspot form the same system and same user).

          I narrowed the issue down to a combination of Cisco VPN client, built in wireless LAN on Dell and HP laptops (both of which use a Broadcom chipset), and usually home wireless routers.
          The thing I found most perplexing about this was that sometimes the problem would go away for several weeks. I mean all 20 users would all of a sudden start working again. We could not trace this occurrence to any patch event, etc.
          Sometimes just installing the latest WLAN drivers from from Dell would resolve the issue. But then a few weeks later it would pop-up again.
          I tried everything, updating router firmware, using different versions of WLAN adapter drivers, different Cisco VPN client versions, changing my WiFi security (WEP, WPA, WPA2, None) options, Still I never found a solution.

          Anyway Dell finally did enough research and posted a solution, and only finalized it a week or two ago. Here is the link:

          The fix is to disable VLAN Priority Support on the WLAN adapter.
          This worked for all my Dell users so far.
          The HP WLAN driver doesn’t have the option available, but its probably the same thing-still researching. So far the Broadcom chipset is the common denominator between the Dells and HP. And I think they make the chipsets for Linksys wireless routers as well. I was not able to gather enough information for those that had the issue to know all the routers that they had when they had problems, or even if it was only certain firmware versions.

          Since this usually only happens at home, my guess is most home routers lack VLAN support and something between the Cisco client, the WLAN driver and the router WiFi support gets confused when a VLAN Priority request is sent or something like that. And since most hotspots/hotels will use a more commercial Wireless router, VLAN is more than likely supported and thus the problem is not encountered. Also the default VLAN priority option is default set to Auto, which may explain why the problem was intermittent.
          Of course this is only a guess.

          One of my users said their problem went away simply when they switched from cable to Fios-possible but I think probably a coincidence.

          I hope this helps everybody out there.

        • #2603201

          Disabling VLAN Priority Support-Worked for our laptop

          by bjarvis ·

          In reply to Disable VLAN Priority Support-Worked for my users

          My wife received a laptop from her company a couple of weeks ago. Her laptop had all the symptoms you cited in your post. I tried everything I could: contacted her company helpdesk, contact our Linksys router tech support, adjusted MTUs, forwarded ports, adjusted IP addresses, tweaked VPN settings, adjusted peer response times, etc. Then, I saw your recent post. Turns out that my wife’s laptop is an HP with that suspect Broadcom wireless adapter (version I disabled VLAN Priority Support on the network card and… the laptop has been operating for 5 hours straight with no hiccups.

          Thanks a lot for the information you provided!

        • #2607374

          Thank you. It worked

          by ksatyagupta ·

          In reply to Disable VLAN Priority Support-Worked for my users


          I have been having this issue for the last 9 months. Me & my husband tried various different options but with no luck. Our Help Desk also couldnt offer support saying, this is home networking and since it works fine with a public wireless network, our job is done.
          It was very very kind of you to post this here. My sincere thanks once again

        • #2610694

          Thank You, Solved My Problem

          by joen ·

          In reply to Disable VLAN Priority Support-Worked for my users

          I have been searching forums, Google etc.. for the past 2 weeks. When I saw your post I new that was it, I tried it and everything works fine. I will pass the info along to our Network Admin. Thank you very much.

        • #2911808

          Solved my problem too

          by steven.humphries ·

          In reply to Thank You, Solved My Problem

          My issue wasn’t identical in that I could never even contact my gateway to input credentials when running over my home wireless network. I’m using a Dell D620 connecting to a TrendNet home wireless router.

          However, once I disabled the VPN Priority (which was set to AUTO), I’ve had no problems since.

          Thanks so much for taking the time to post and help others out!

        • #2921999

          How To Disable VLAN Priority Support?

          by beau_lolo1 ·

          In reply to Disable VLAN Priority Support-Worked for my users

          Thank you for your help, I’m having the same problem, I’m connecting to the internet through a USB-Modem, and the VPN-Client connects normally but I can’t access any thing on the vpn-nw, kindly send the steps to disable the VLAN priority.
          Thanks again.

        • #3035842

          Here’s the article now…

          by chlump ·

          In reply to How To Disable VLAN Priority Support?

          Under the “Advanced” Tab of the properties page of the wireless device inside the windows device manager is the VLAN setting.

        • #2803251

          It worked for me too…

          by anish.basheer.m ·

          In reply to Disable VLAN Priority Support-Worked for my users

          Thank you so much for the post… I was trying to figure out the same issue….. I did the same thing as explained in the post and it worked fine for me…. I disabled the VLAN priority support which enabled me to browse the internet and intranet.

        • #2803623

          Another solution., because I don’t have the vlan-priority setting

          by hbarten ·

          In reply to Disable VLAN Priority Support-Worked for my users

          I have no VLAN-priority setting on my NIC.
          I have a NETGEAR WG311 and a Netgear router.
          I had the problem, that I couldn’t connect to VPN at the office.
          Now, I have the solution for that.
          I use windows for finding the networks instead of Netgear-software (It’s a choice yout must make at installation of the Netgear-software).
          Probably it’s the most easy way by re-installing the netgear-software and choose for the Windows option instead of the netgear-option.
          Remember: first be sure you have the security-key of the router.

          For me: this was the solution.
          I hope this can be the solution for you too.

        • #2982399

          Very concise info!! But i have Realtek wireless adopter

          by mfhorizon ·

          In reply to Disable VLAN Priority Support-Worked for my users

          My Boss asked me how to access Cisco VPN from his home. He is having “TOSHIBA” laptop and have “Realtek RTL8187B Wireless 802.11b/g 54Mbps USB 2.0 Network Adapter”, with VISTA HOME EDITION.

          I tried installing Cisco VPN client for vista and with little effort i was able to configure vpn client. But when it connects it says:

          Secure VPN Connection terminated locally by client.
          Reason 412: The remote peer is no longer responding.
          Connection terminated on: date…. time

          I need if you have any clue for this kind of problem.

        • #2941542

          Why the problem comes and goes.

          by richmeister ·

          In reply to Disable VLAN Priority Support-Worked for my users

          I had this same issue and resolved it by disabling that same setting. The reason for the issue is whenever another WiFi client accesses the AP. Anything even an iphone. I assume it has something to do with the return routing on the home router. 100% I could send but never recieved my packets back.

    • #2522982

      additional software

      by srush ·

      In reply to Running Cisco VPN client on a wireless connection

      Some VPN software requires an additional component added to them to allow wireless VPN. I know that the AT&T client requires that you install “Net Firewall Service” to allow it to connect. Check out this avenue.

      • #3035841

        Enabled “QOS Packet Scheduler” and “Deterministic Network Enhancer”

        by chlump ·

        In reply to additional software

        I am running Cisco VPN client on Windows XP Professional on a Dell Latitude 620 laptop with an Intel 3945ABG wireless built in adapter and a Buffalo WHR-HP-G54 wireless/wired home router connected to a Comcast Cable modem.

        VPN has always worked for my wired connection, no problems, but not my wireless.

        My Wireless connection was fine with no VPN, but when I connected VPN nothing worked, nothing to internet or my corporate network. That made sense because the VPN client routes everything to/from the corporate network and blocks the internet so the internet actually comes from the corporate network when I am connected.

        Once, I tried disabling my LAN connection (even though it was unconnected so it was down anyway) and this worked – for about a week. Then the VPN stopped working, then a week later started again, etc., intermittent.

        Sometimes, I could send packets from the VPN adapter to the network, but nothing would come back. Sometimes it didn’t send or receive anything. This was from looking at the statistics page for the VPN client.

        One night I got fed up and tried to figure out the answer all night. After 8 frustrating hours, I downloaded Wireshark and was looking at the traffic. It still didn’t really help, the packets wouldn’t show up on ANY adapter. I was sure the router was dropping them.

        But then I noticed that Wireshark said (Microsoft Packet Scheduler) next to the wired and VPN adapters, but not the wireless adapter. I thought that was curious.

        So I went into the properties for the wireless adapter (right click and select properties on the wireless adapter in the Network Connections window), and found that the network features in the window on the general tab that says, “The connection uses these following items”… had a couple things unchecked. The:

        -QoS Packet Scheduler
        -Deterministic Network Enhancer

        were both unchecked. But they WERE checked in the Wired adapter and Cisco adapter. So I checked those boxes and restarted.

        Voila! VPN started working over the wireless connection, and has been working now for a while without hiccups.

        Hopefully that could help some of you out there.

        • #2850350

          VPN in windows 7

          by jigar80patel ·

          In reply to Enabled “QOS Packet Scheduler” and “Deterministic Network Enhancer”

          i have vpn client 6 and Wondows 7 ultimate.
          i am not able to connect through wireless network. i tried your sugeestion but in my modem
          1. QoS Packet Scheduler
          2. Deterministic Network Enhancer is not there. please help me to solve it.

        • #2850346

          Better to ask a new question

          by tobif ·

          In reply to VPN in windows 7

          You hooked a new question into an old thread. You’re better off starting a new thread with your specific problem. Just click on the button “Ask question”.

    • #2606325

      Cisco VPN Client via wireless

      by pshoaf ·

      In reply to Running Cisco VPN client on a wireless connection

      I just started using Cisco VPN. I have installed on several laptops to date. Several Acer laptops, and 1 Gateway laptop. The Acers were all running XP Pro, the Gateway is running Vista Home Premium. The Acers (which have Broadcomm wireless nics) have worked flawlessly. The only problem being the timeout set on our Cisco 5520 Firewall, causing a disconnect after timeout of not activity being too short. I have run into some problems on the Gateway (I don’t know which wireless nic it uses) where I will still have a VPN connection & IP but I can not access the network behind my firewall. If I disconnect the VPN Client and restart it, all is well. The Acers work perfectly. My laptop, an Acer Ferrari, even worked when I used a Verizon Wireless Card to connect the VPN. I was on until my battery started to give out.

      Has anyone else had any experience with Vista and wireless VPN access?

    • #2967235


      by seans ·

      In reply to Running Cisco VPN client on a wireless connection


      I am not able to help much as I myself have the same issue. We connect to a client system via Cisco VPN Client at work and it connects perfectly on all computers, wireless and ethernet cable.

      As soon as I get home however, I connect on my laptop through the wireless network and as soon as I connect to Cisco VPN it disconnects me from my home network and I need to reset the router.

      If you are able to find a resolution for this please let me know., I will do the same if I do. Just send your email address to mine if you like.


    • #2964350

      Running Cisco VPN client on a wireless connection

      by jbunderwood ·

      In reply to Running Cisco VPN client on a wireless connection

      I have a similar issue and I have found that if you have the ethernet port linked it will work fin, I made a loopback adapter and plugged it in and wahla my Outlook and local network are available via the wireless. I am using a Linksys wireless router so I do not think it is your router. For the Cisco VPN are you using the UDP setting or the TCP? I am guessing it is set to UDP. That is my guess on where the problem lies but I am not positive because I cannot not change the setting on my VPN.

    • #2838875

      VPN Connection Loss

      by toadfritter ·

      In reply to Running Cisco VPN client on a wireless connection

      I have run into this with some laptops at one of our locations. What I found was that the power settings for “Plugged-In” were set incorrectly. After having the engineer change his power settings to “NEVER” when plugged in his connectivity issues went away when he connected to the network via VPN.
      Hope this helps.

    • #2440171

      This worked for me :)

      by wesmjc ·

      In reply to Running Cisco VPN client on a wireless connection

      I’m using Cisco VPN Client – Version Disconnect from the VPN client. Next, highlight the connection then click on the ‘Modify’ icon. Click on the Tranport tab and at the bottom make sure ‘Allow Local LAN Access’ is checked.

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