well, i did all the things as I mentioned before many times. we are talking about basics here, obviously we cannot find a good explanation of what's really going on....

netstat shows following:

TCP 0.0.0.0:4605 LISTENING 3912

I guess thats where the problem is.

i have verified that browser is running. i am not even trying to change code because i cannot even connect using SQL Management Studio. I just tried today again. worked...

I have restarted server, i have opened port on router and firewall ( I have also disabled firewall), I have changed port while connecting to server. According Microsoft docs it...