How to Fix "A connection timeout occurred" error on Mac

When i try to connect my MacBook pro to an Airport Express (running in dual mode) in 802.11n 5Ghz, i am getting this error “Failed to join “network” A connection timeout occured”.
Rebooting both Mac and Airport Express not fix this issue.
Fix 1:

  1. Remove and forget the network in is entirely.
  2. When you see 5ghz SSID display under new networks choose it. Error will occur.
  3. Disable SSID for the 2.4ghz (If you are suing the same name).
  4. Then enable WiFi password to use none.
  5. Once you complete this steps your Mac Pro or Mac Mini was able to connect to the 5Ghz SSID.
  6. Left the computer connected and log onto your access point & re-enable the WPA/2 encryprtion.
  7. As the Mac computer disconnected, attempt to relog (this time with a password). It will work,

Fix 2 (for Netgear WNDR3700 running DD-WRT)
Deleting preference file or removing known networks not fix your issue.
Change to NA-mixed.
Fix 3: 

  1. On your Mac click the WiFi symbol on the top toolbar.
  2. Choose “Open Network Preferences”
  3. Select “Assist Me” button at the bottom.
  4. Select “Diagnotics” button on the popup.
  5. Choose “WiFi” and click Continue.
  6. Choose the Network Connect and click Continue.

Also try our suggestions

  • “Connection timeout” issue was caused by the DisplayPort to Dual-Link DVI Adapter. Put the adapter further away from your MacBook Air.
  • Use WPA2 instead of WEP on routers.
  • Change the network type from N-only to NA-mixed.
  • Navigate into router setup and find advanced settings. Locate the option for UPNP and disable it.
  • Restart the router.
  • Downgrade your Knext driver
  • Turn hibernation OFF on the Airport and restart the OS.
  • Unplug your wifi router for 40 sec and plug it in again.
  • Navigate to Macintosh HD ->Library ->Keychain, Open file System.Keychain. Right click and delete all the keychain having name with problematic SSID. EClose keychain and try to reconnect that ssid.
  • Navigate into Network Preferences. Delete the Wi-Fi interface from the left column. Click Apply. Re-add the Wi-Fi interface and click Apply.
  • Run your router firmware update.
  • Some times this issue happened because of te hardware issue. Take your device to Apple Care.
3:53 am

3 responses to How to Fix "A connection timeout occurred" error on Mac

Perhaps the wires acted as antenna or otherwise changed the power available to the Wi-Fi chipset, but I'm not seeing these timeouts after changing my connected devices and cables.

This is not helpful at all. I don't know how to do this. I shouldn't have to go through all of this just to access websites. I bought a Mac because I didn't want to have tech issues. Now I can't even access certain websites when I need to.

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