How to Di­ag­nose con­nec­tion is­sues


The first place you should look to check your Mac’s con­nec­tion is Sys­tem Pref­er­ences’ Network pane. Se­lect Eth­er­net or Wi-Fi, de­pend­ing on which one you use. If the cir­cle next to it is red (no con­nec­tion) or yel­low (not con­fig­ured), the pane should pro­vide info on the prob­lem, such as a miss­ing In­ter­net Pro­to­col (IP) ad­dress — the set of four num­bers begin­ning ‘192.168.’ that uniquely iden­tify a de­vice — or lack of an in­ter­net con­nec­tion. If that’s not enough to iden­tify the is­sue, how­ever, then use the fol­low­ing steps to make fur­ther checks.

Check your Wi-Fi

Hold Alt, click the Wi-Fi menu bar icon and choose Open Wire­less Di­ag­nos­tics. Click Con­tinue to run a se­ries of tests, then click each re­sult for a de­scrip­tion of what it has found.

Run some tests

Use Spot­light (Cmd+Space­bar) to open Network Util­ity. In the app’s Ping tab, type your router’s IP ad­dress and click Ping. If the pack­ets are all re­ceived, the is­sue isn’t with your Mac.

Ver­ify IP set­tings

Go to Sys­tem Pref­er­ences> Network. Se­lect your con­nec­tion type and see if an IP ad­dress has been as­signed — if set man­u­ally, choose, TCP/IP. Try set­ting IPv4 to Us­ing DHCP.

Re­new the lease

Try re­new­ing the lease of the IP ad­dress given by the router. If the is­sue per­sists, pick ‘Us­ing DHCP with man­ual ad­dress’; en­ter an un­used one, leave the mask as is, and ver­ify the ad­dress.

For­get your Wi-Fi

If you use Wi-Fi, click Ad­vanced > Wi-Fi, se­lect the mis­be­hav­ing network in the list and click – (mi­nus) to re­move it. Click OK, Ap­ply, then the Wi-Fi menu bar icon and con­nect from scratch.

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