VPN disconnects between USG-Flex 200 and Zywall USG-20

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  • valerio_vanni
    valerio_vanni Posts: 64  Ally Member
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    No, the ISP is the same. As far as I know, there were no changes.

    It seems to me that something is not working inside Zywall USG-20. I can always reach it in https and ssh, but it seems that it's unable to reconnect tunnel by itself. As if it is ignoring "nailed up" settings.

    If I logon and
    -deactivate vpn policy
    -save
    -reactivate vpn policy
    -save
    it connects immediately.
    And all the times.

    What could be an ISP issue that prevents tunnel connection but allows it with this actions?




  • valerio_vanni
    valerio_vanni Posts: 64  Ally Member
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    Hi @valerio_vanni
    If there are multiple "Server Role" VPN rules on FLEX200?
    I tried to disable all IPSEC/L2TP part (both gateway and connection).

    So, at this moment, the answer is no.
    And it doesn't work as before.
  • Zyxel_Stanley
    Zyxel_Stanley Posts: 1,361  Zyxel Employee
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    Hi @valerio_vanni
    You may have a try on 3.30WK48 firmware which is the latest version released at Dec 2016. If the issue still exist, we may need further troubleshoot via private message.
  • valerio_vanni
    valerio_vanni Posts: 64  Ally Member
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    Hi @valerio_vanni
    You may have a try on 3.30WK48 firmware which is the latest version released at Dec 2016. If the issue still exist, we may need further troubleshoot via private message.
    I have this (and have reloaded it some day ago), is it the same? .bin files have different sizes

    https://www.zyxel.com/support/download_library/product/usg_200_100_plus_100_50_20w_20_7.shtml?c=gb&l=en&pid=20110504103122&tab=Firmware

    In web interface I read:
    Boot Module: 1.14
    Current Version: 3.30(BDQ.9)
    Released Date: 2016-11-22 09:50:31







  • Zyxel_Stanley
    Zyxel_Stanley Posts: 1,361  Zyxel Employee
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    Hi @valerio_vanni
    3.30WK48 firmware was released at Dec 2016. 
    The firmware include some minor fixes for specific scenarios.
    You may have a try 3.30WK48 firmware first. If still doesn't help, may need further troubleshoot by private message.
  • valerio_vanni
    valerio_vanni Posts: 64  Ally Member
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    I update on this issue.

    I asked the ISP, they saw some issue on line and tried to reboot their router.

    From then vpn has been working. After some day I reactivated all IPSEC/L2TP part (I had deactivated it to diagnose) and again all kept working.

  • Zyxel_Stanley
    Zyxel_Stanley Posts: 1,361  Zyxel Employee
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    Hi @valerio_vanni
    It's good to know there is no VPN connection issue in current running versions. :)

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