Unable to connect to wifi (connection timeout). Think it's because I'm running old software but can't update it without an internet connection! Any ideas pls?

Take each of the following steps that you haven't already tried, until the problem is resolved. Some of these steps are only possible if you have control over the wireless router.

Step 1

Turn Wi-Fi off and back on.

Step 2

Restart the router and the computer. Many problems are solved that way.

Step 3

Change the name of the wireless network, if applicable, to eliminate any characters other than letters and digits. You do that on your router via its web page, if it's not an Apple device, or via AirPort Utility, if it is an Apple device.

Step 4

Run the Network Diagnostics assistant.

Step 5

In OS X 10.8.4 or later, run Wireless Diagnostics and fix the issues listed in the Summary, if any.

Step 6

Back up all data before proceeding.

Launch the Keychain Access application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

Enter the name of your wireless network in the search box. You should have one or more "AirPort network password" items with that name. Make a note of the name and password, then delete all the items. Quit Keychain Access. Turn Wi-Fi off and then back on. Reconnect to the network.

Step 7

You may need to change other settings on the router. See the guidelines linked below:

Recommended settings for Wi-Fi routers and access points

Potential sources of interference

Step 8

Make a note of all your settings for Wi-Fi in the Network preference pane, then delete the connection from the connection list and recreate it with the same settings. You do this by clicking the plus-sign icon below the connection list, and selecting Wi-Fi as the interface in the sheet that opens. Select Join other network from the Network Name menu, then select your network. Enter the password when prompted and save it in the keychain.

Step 9

Reset the System Management Controller (SMC).

I really need help. I've been having the same problem all day. Although some sites I try to load say "Gateway Timeout: Can't Connect To Remote Host" or just straight up "Failed to open page because the server where this page is located isn't responding." It loads Youtube and Apple but when I try to access other sites like Twitter, Facebook, Netflix, even college websites, it wouldn't load a bit. I restarted my router a lot of times. Deleted and reinstalled browsers and my anti-virus which is Sophos. Also did Diagnostics for my wifi connection and it says that it's working fine and no issues were detected. I'm just really worried because I don't know if it's my router or my computer or if I've been hacked? Please reply ASAP! I'm just really worried because school is starting soon and I'm afraid that I can't even access to my college website because of this issue. Thank you so much.