L2TP VPN timeout on android device after 2 minutes

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eifelrudi
eifelrudi Posts: 11  Freshman Member
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edited April 2021 in Security

Hi,

i have configured L2TP VPN over Wizzard - connection from android works fine. i can access the remote devices.

But - after 2 minutes the connection is dropped (disconnected) from Zywall 110.

Firmware: 4.35 (AAAA.2)

image.png


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  • eifelrudi
    eifelrudi Posts: 11  Freshman Member
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    Hi,

    ich kann die Frage noch besser in Deutsch formulieren ...

    Ich habe l2tp und ipsec-vpn komplett lauffähig mit der Zywall, unter l2tp vom android-tablet bekomme ich aber immer nach 2 Minuten einen Disconnect - siehe Protokoll oben.

    Wie gesagt, l2tp habe ich per Wizzard eingerichtet - und grundsätzlich funktionierts ja, aber mit diesem Disconnect ist natürlich kein Arbeiten möglich.

    IPSec-VPN funktioniert mit verschiedenen (Windows-)Clients einwandfrei.

  • PeterUK
    PeterUK Posts: 2,714  Guru Member
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    edited February 2020
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    Have you set for the VPN user with lease time to 2mins? As that is a bug that has been fixed in V4.35(AAAA.0)ITS-WK46-r90773 and is not in 4.35 (AAAA.2)

    In L2TP VPN set keep alive timer to 1 second

  • eifelrudi
    eifelrudi Posts: 11  Freshman Member
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    i have done - no change.

    i have tested zwice, 2 minutes after connect zywall disconnects me.

  • eifelrudi
    eifelrudi Posts: 11  Freshman Member
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    image.png


  • PeterUK
    PeterUK Posts: 2,714  Guru Member
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    edited February 2020
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    What is your Phase 1/2 Setting for SA life time? I have 86400

    Does the ZyWALL 110 have the WAN IP or is their another NAT router?

  • eifelrudi
    eifelrudi Posts: 11  Freshman Member
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    same values here

  • PeterUK
    PeterUK Posts: 2,714  Guru Member
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    edited February 2020
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    Just changed my ZyWALL 110 to 4.35 (AAAA.2) and no problems connecting my android device by VPN when user lease time set to 1440

  • zyman2008
    zyman2008 Posts: 199  Master Member
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    I suggest all to update your firmware to this hot fix ASAP. If you running with 4.35.

    https://businessforum.zyxel.com/discussion/3925/zyxel-security-advisory-for-the-remote-code-execution-vulnerability-of-nas-and-firewall-products


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