@Kevin_Z Yes, i have a synology behind and i want to use it as an VPN Server. L2TP. It was working perfect with my old tp link Archer c6. If i open DMZ für the host it still tells me "Conflicting...

@Ivaylo i dont know whta you want to tell me. Its just a Problem with this router. If i use my old Archer C6 i can open all the ports is want.

@Ivaylo still same problem. i also checked all the other options to turn them on and off. still: Conflicting with existing port: 1701. To avoid conflict, please enter another value.

@Ivaylo it es already on and not working.

I have a now router the c80. If i try to forward PORT 1701 for VPN, it tells me "Conflicting with existing port: 1701. To avoid conflict, please enter another value." Please help me and all the other...

@Atlasior Same Problem here. Whats the Problem TP Link? Pls update as soon as possible or i need to send back the router.