"Your connection to matchmaking servers is not reliable" message on CS:GO?

When ever I try and connect to a Counter Strike: Global Offensive (casual or comp) game it gives me this message:

Your connection to matchmaking servers is not reliable.

How can I fix this?

Best Answer

This message has appeared for me several times, and I followed the instructions on this Reddit thread and it's worked for me every time.

Quit out of steam fully. Then run it as administrator. After launching steam, (assuming you're using Windows), open CMD and type in the following commands:
"ipconfig /release" - Will release your IP form your router (internet will not work for now)
"ipconfig /renew" - Will assign a new IP from your router (internet will work)
"ipconfig /flushdns" - Will flush DNS; helps with an overflow of packets.**

Try again, you should now be able to connect properly.

How to Fix CS:GO Failed to Connect to Match

What Causes CS:GO Failed to Connect to Match?

Solution 1: Verify the Integrity of Game Cache.

Solution 2: Disable Windows Firewall.

Solution 3: Change Your DNS Address.

Join community servers

Launch CS:GO and choose Play.

Select Community Server Browser from the drop-down menu.

Type in region names or sort servers by ping/region. The servers with higher ping values will be farther away from your region.

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.