@Kevin_Z thanks! I will definitely follow these steps

Hello @Kevin_Z 

Unfortunately I'm facing also the issue, that the VPN connection is not working. I followed the linked guides, but still not working:

I set up a dynamic dns via tplinkdns, seemingly it works (nslookup command could resolve the address, the IP is visible)

I enabled the OpenVPN server on my AC1200 router, (type: TCP, port: 1194, /w subnet/mask: 10.8.0.0 / 255.255.255.0)

Certificate exported, imported to OpenVPN.

I disabled the firewall.

result: The VPN connection is working only when my PC is connected to the same local network, where my router is. But it doesn't work from a distant network, see my logs:

Sun Aug 23 08:25:36 2020 Attempting to establish TCP connection with [AF_INET]100.66.166.123:1194 [nonblock]
Sun Aug 23 08:27:37 2020 TCP: connect to [AF_INET]100.66.166.123:1194 failed: Unknown error
Sun Aug 23 08:27:37 2020 SIGUSR1[connection failed(soft),init_instance] received, process restarting
Sun Aug 23 08:27:42 2020 WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.
Sun Aug 23 08:27:42 2020 TCP/UDP: Preserving recently used remote address: [AF_INET]100.66.166.123:1194

What I can't understand is that when I try to ping my public IP, there is no response (timeout). Did I miss to set up / configure something in the router?

Thank you in advance!

I'm having a similar issue, but not with this exact router, but the Archer C7 v5, the moment I generate a .ovpn file, I test it out and it works wonders for the fitst few hours outside the network, after maybe 4 hours, it stops connecting, OpenVPN keeps trying to connect like if the router doesn't even exist.

EDIT: how do I remove the colors on the fonts? lol

@SH4D0WBROK3R 

I have the same problem with TP-LINK Archer C1200.
Firmware: 2.0.2 Build 20180118 rel.38979 (EU) 
Archer C1200 v2.0
After generating the certificate and exposing it, the VPN works on external devices for no more than a week.
External devices, e.g. smartphone, computer.
I have a static IP address.
I followed the instructions https://www.tp-link.com/pl/support/faq/1544/
I followed the post

Correct time is set on the router, synchronized with the NTP server and correctly set time zone (UTC).

What may be the problem?

PS.

When my VPN stops working, all I need to do is press the Save button and the VPN starts working.(In the meantime, I do not change anything in the configuration!)

@Davidds 

I checked one thing.
The VPN does not work after rebooting the rotuer.
Just press SAVE and the VPN works again.

Do you have a solution to this problem?

@Kevin_Z 

My Archer C1200 not working open VPN it's working on TCP but on the WiFi rage if i connect on mobile data vpn not working i tried but failed

@Davidds 

Can you brief what did you do to work the VPN I'm trying everything but i couldn't fix it..😑😑