Error Nebula VPN L2TP
GreenBureautique
Posts: 5 Freshman Member
in Nebula
Hello,
I have a problem with my L2TP VPN on my USG FLEX 200. Previously the VPN worked well but suddenly an error message appeared on Windows 10 client workstations "the l2tp connection attempt failed because the security has encountered a "nebulous" error. Anyone have a solution?
Thanks
I have a problem with my L2TP VPN on my USG FLEX 200. Previously the VPN worked well but suddenly an error message appeared on Windows 10 client workstations "the l2tp connection attempt failed because the security has encountered a "nebulous" error. Anyone have a solution?
Thanks
0
All Replies
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After a Windows Update patch?
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We tested with several computers but always the same error message.
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Hi @GreenBureautique,
Could you send me your org, and site name in PM.
We would like to check if it is device issue, or windows client issue.0 -
Hi, OK
Thanks0 -
I sent you a private message. Have you been able to look at the problem ?
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Hi @GreenBureautique,
Your firewall both wan1 and wan2 are behind NAT. As we test, there is no any connection log when we test L2TP dial up from Internet to FLEX500.
Please help to check if uplink router have port mapping for IKE, ESP, and NATT.0 -
Hi, thanks for your reply, no there is no port mapping.
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Hi @GreenBureautique,
Since our gateway is behind NAT(firewall wan is private IP. ), uplink router must have port mapping for IKE, ESP, and NATT. Without port mapping, Internet hosts cannot reach our firewall interface for l2tp access. the scenario is similar to below link.
https://community.zyxel.com/en/discussion/675/how-do-i-configure-the-zywall-for-a-l2tp-server-behind-nat
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