Connection failed after 6 retries Problem

Connection failed after 6 retries.

1. Try changing the client port. First Go into Garry's Mod properties in Steam > Then go to Set Launch Options > put in +clientport 27006 OR 27005 and then doing the same thing into console to 100% make sure the client port is working. 
2. Try flushing DNS cache. You can do this by opening CMD and then pasting the command ipconfig /flushdns and then disabling and enabling WiFi.
3. Try changing the DNS servers being used. The most common one someone can use is 8.8.8.8 and 8.8.4.4 (Google DNS).

How to change DNS server?

1. Press the Windows key on your keyboard.
2. Type in “control panel” and open the Control Panel app.
3. Click Network and Internet.
4. Go to Network and Sharing Center.
5. Click on Change Adapter options.
6. Right-click on Ethernet network and click Properties.
7. In the Ethernet Properties window, click Internet Protocol Version 4 (TCP/IPv4), then select Properties.
8. In the Internet Protocol Version 4 (TCP/IPv4) window, select Use the following DNS server addresses:
9. For your preferred DNS server, type in: 8.8.8.8.
10. For your Alternate DNS server, type in: 8.8.4.4.
11. Make sure to enable Validate settings upon exit box, then click OK.