Please exit Steam and go to the folder called C:\Program Files\Steam\ (this is the default location for a Steam installation - if you set a different installation directory, you will need to browse to it).
Delete all of the files in this folder except: The \Steamapps\ folder and (this file is listed as an application and features the black and white Steam logo)Restart your computer.
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Here you find antivirus and firewall applications, as well as DVD emulation software, download accelerators and other apps that may cause the issues.
If it is a Steam server issue, there is not really a lot that you can do on your side to get it fixed.
You basically can delete all files except and the steamapps folder.
Chance is, if the former did not work, this won't work as well.
Then, launch from within the Steam installation folder, and not from a pre-existing shortcut. You can try to delete specific files first to see if it resolves the issue.
Delete Client Registry.blob, App Update and the appcache folder and see if it resolves the issue.
In some cases though, you can work your way around then.
Since yesterday for instance, Steam is reporting that some European users, especially from Germany, can't connect to Steam anymore.
If you have installed new software, or updated software, since the last successful connection to Steam, you may want to check and see if the installation or update is causing the connectivity issues.