How to fixed Wan for PPTP server

My MK with 2 wan load balancing:
Wan1: 14.181.224.13
Wan2: 203.113.81.34

Now make PPTP server with only Wan 2. How to config. Thanks

Use firewall and block inbound GRE and TCP 1723 when inbound interface is wan 1

If you want outbound VPN connections to only go out WAN 2, then you have to use firewall to mark TCP 1723 and GRE packets with a routing mark. Then add a new route in IP > routers to route those packets only over WAN2.

Thank your support