Can't connect to any gaming servers

According to the League of Legends Forums (here) you can try this:

Some sort of Maestro Error

1. Restart your computer
2. Temporarily Disable/Make exceptions in your Anti-virus/Anti-spyware software
3. Temporarily Disable/Make exceptions in your Firewall
4. Disable process protection software.
5. Make sure you're running software in Administrative Mode/With admin privileges
6. In Windows Vista/Windows 7, double check your Account Controls
7. Reset your Internet Explorer Settings and make sure you have not disabled scripting options

One person solved it by going to

C:\Riot Games\League of Legends\RADS\projects\lol_air_client\releases\0.0.0.237\deploy

and setting LolClient.exe to run as admin.

One person updated Windows by running Windows Update and the problem was solved.

It's quite a common error and many people have odd ways of solving it. But since LoL and Steam don't connect I assume it's strictly connection or permissions.

EDIT: Here's a video that explains how to fix the problem. (He explains the Maestro Error at 2 min 24 sec. It has to do with Anti-Virus ;) )

I've had this happen to me and it was the Anti-Virus I was running (Kaspersky btw). I tried white-listing it on the firewall, Virus list EVERYTHING and it still didn't work. The only way I managed it to work was to play with the Anti-Virus turned off. (But this was my personal case).

END EDIT

If you can solve it for LoL you will most likely solve it for Steam.

I wish you good luck! and I hope that I gave you some good things to try and fix the problem since we never know for sure what the solution is.

Only thing I can suggest is calling your internet provider. Best thing you can do is get an I.T. guy to come check it out. Only thing I think that's possible to check on your router settings would be ports, but other than that, and based on the comments, I think this is on their part.

This may be a server browser problem. I just had a similar issue a few days ago which was solved by deleting 2 steam files:

Serverbrowser Problems

If you only have a problem with servers listing or staying listed or in history (but can play otherwise (client problem), you should be able to solve the problem by closing Steam, deleting masterservers.vdf and serverbrowser.vdf in the Config directory, and re-launching Steam.

Source

I could not see any servers when I right-clicked on the steam tray icon and selected "servers." I also could not get a server list from within a particular game (Killing Floor). It seemed to hang on "getting master server list" and never got a list.