(getsockopt) Failed to connect to server. Connection refused: getsockopt

Hello,

I have a joining problem that i cant solve

it is about the  error: getsockopt

What tried to solve this problem:

1. restart minecraft

2. restart pc

3. reinstall minecraft

4. firewall solution (see yellow note in link, MC-227913){*}*

5. I also tried following these steps : 
   Try the following on Windows:
   Press the Windows Key, then type cmd.
   Under 'Command Prompt,' click Run as administrator
   Type netsh winsock reset and press Enter.
   Type netsh int ip reset and press Enter.
   Type ipconfig /release and press Enter.
   Type ipconfig /renew and press Enter.
   Type ipconfig /flushdns and press Enter.

6. And these ones :
   Press the Windows Key, then type cmd, right click on "Command Prompt," and click Run as Adminstrator.
   Type netsh interface tcp show global and press Enter.
   If Receive-Side Scaling State is disabled, type netsh interface tcp set global rss=enabled and press enter. If "Receive Window Auto-Tuning Level" is disabled, type netsh interface tcp set global autotuninglevel=normal and press enter. Restart Minecraft and try the realm/server again.

i have tried all the above steps and nothing helped. i dont know what to do next is there anyone who can help??