Issue with L2TP IPSEC VPN on V4.35 firmware

Brady

We had been using V4.30 firmware for over one and half year. Its L2TP VPN worked fine for us. We never really had connection issue.

Recently we upgraded to V4.35 firmware, we now started to see L2TP VPN connection issue on Mac. VPN tunnel is established, but users can not connect to any internal website. When this happened, I tried ping internal IP address, it didn't work. I had to reboot router to make it work.

Have anyone here seen similar VPN issue with V4.35 firmware?

mMontana

Would you please double check the ports that are allowed from WAN to ZyWall (firmware notation) if 1701 UDP is still allowed.

Also, double check the firewall rules from IPSec zone and L2TP subnet to LAN1 zone and subnet.

Brady

Thanks for the suggestion. I added 1701 UDP. It didn't help. I also add a policy to make sure traffic from L2TP subnet to LAN zone and subnet, but it doesn't make difference.

It failed again today. I rebooted once, it didn't work. I had to reboot for the second time for it to work. Since this happens very often, I am thinking reverting to old firmware version.

Zyxel_Emily

Hi @Brady,

We need the configuration file to check the symptom. I will contact you in private message for more information.

Brady

Thanks!