Problem l2tp connect

integratedsolutions

Good evening,
We have a Zyxel VPN 100 and the L2TP protocol enabled, which several users with Macs with their configurations use. Everything worked for a week now, but it no longer works without any changes. Can you tell us what the problem is based on the logs I've attached and how to fix it?

warn sessions-limit ACCESS BLOCKMaximum sessions per host (1000) was exceeded. [count=67]
619 2025-09-29 11:59:13 82.52.139.253:51381 192.168.100.2:500info ike IKE_LOGThe cookie pair is : 0x548ac67f509aff13 / 0x0000000000000000
620 2025-09-29 11:59:13 82.52.139.253:51381 192.168.100.2:500info ike IKE_LOGRecv Main Mode request from [82.52.139.253]
621 2025-09-29 11:59:13 82.52.139.253:51381 192.168.100.2:500info ike IKE_LOGThe cookie pair is : 0x0fd6ecf1b3cd7690 / 0x548ac67f509aff13
622 2025-09-29 11:59:13 82.52.139.253:51381 192.168.100.2:500info ike IKE_LOGRecv:[SA][VID][VID][VID][VID][VID][VID][VID][VID][VID][VID][VID][VID]
623 2025-09-29 11:59:13 82.52.139.253:51381 192.168.100.2:500info ike IKE_LOGRecv IKE sa: SA([0] protocol = IKE (1), AES CBC key len = 256, HMAC-SHA256 PRF, HMAC-SHA256-128, 2048 bit MODP, HMAC-SHA1 PRF, HMAC-SHA1-96, HMAC-MD5 PRF, HMAC-MD5-96, HMAC-SHA512 PRF, HMAC-SHA512-256, 1536 bit MODP, 1024 bit MODP, AES CBC key len = 128,
624 2025-09-29 11:59:13 192.168.100.2:500 82.52.139.253:51381info ike IKE_LOGThe cookie pair is : 0x548ac67f509aff13 / 0x0fd6ecf1b3cd7690 [count=3]
625 2025-09-29 11:59:13 192.168.100.2:500 82.52.139.253:51381info ike IKE_LOG[ID] : Tunnel [RemoteAccess_L2TP_Wiz] Local IP mismatch

PeterUK

Disable session limit set in VPN connection local policy to IP 0.0.0.0

Do you have internet access out the WAN port?