On Saturday I was setting up a TS server on my Ubuntu machine and on Sunday I was checking it, if the process is still alive and suddenly I was able to see 4 strangers on my server!
I checked our router-settings immediately: the only ports forwarded were HTTP, HTTPS, Minecraft
Then I started to panic! I tried to reach my server from outside with my phone but I got an error. TS’ port was closed at that time!
After that I started to panic even more and shutdown my server.
Please help me explaining this or I have to purge my server due to a hacking attack
How can someone connect to my TS which was just set up, no ports forwarded and for myself not reachable from outside??