Can't connect to my own TS 3 server

We are gaming clan that have used TS for many years. And I have hosted the server privately. But after a reinstall of win 10 at some point I was longer able to connect my own TS server. We have used Discord after that, but it just is inferior to TS.

I’ve tried again to install . I use Win 10 PRO and windows defender as firewall. I’ve allowed TS to communcate with internet and even tried to disable the firewall. Still, it won’t work.

I have a fixed internal IP that is set to DMZ mode.
I try to connect with to my external IP from TS client 3;
«Failed to connect to server»
ISP is

Please give me a clue of what I can do

Regards Tom Lervold

Ok. Thanks. I’m in.