Unable to connect to HTTP Proxy -or- Unable to connect to server

source : https://support.steampowered.com/kb_article.php?ref=7549-MURQ-4431

Unable to connect to HTTP Proxy -or- Unable to connect to server

Question

I receive one of the following errors when accessing the Steam Store or Steam Community from within Steam:
Unable to connect to HTTP Proxy. Your proxy may be misconfigured or offline.-336
Unable to connect to server. Server may be offline or you may not connected to the internet.-102
What should I do?

Answer

Important:

Steam does not support the use of a proxy server. If you require a proxy server for normal internet access, it will need to be disabled or bypassed for Steam to function.

Windows Users - Disabling proxy settings.

Exit Steam.
Click Start > Run (or Windows Key + R)
Type inetcpl.cpl and click OK.
Click the Connections tab.
Click the LAN settings button.
Note: You may want to write down the settings currently found in this window if you need to undo these steps later.
If any items on this window are checked, uncheck them.
Click OK to close any open windows and restart your computer.
Now, launch Steam and test the issue.

Mac Users - Disabling proxy settings.

Exit Steam.
Click the Apple menu and select System Preferences
Choose Network from the Internet & Wireless section.
Click the lock in the lower left corner to enable the ability to change settings.
If prompted, enter your password (Administrative privilegs required).
The lock icon will now appear open.
Select your primary network connection (Default is Ethernet).
Click the Advanced button.
Click Proxies.
Note: You may want to write down the settings currently found in this window if you need to undo these steps later.
If any items here are checked, uncheck them.
Click OK and then Apply.
Close any open windows and restart your computer.
Now, launch Steam and test the issue.

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