Macbook not connecting to wifi modem

I am unable to connect to my wifi modem using my Macbook Pro airport utility. The modem was attached as preferred network and was working fine till yesterday. As soon as the mac was switched on, it used to connect to the modem immediately. Now, I am not able to connect by creating a new connection. It is refusing to connect to the modem wirelessly, whereas other devices (Laptop/Phones) are still connecting to the said modem easily. It is surprising that I am able to connect to the modem using ethernet. All the more surprising, though I am connected to internet while typing my quary, I am unable to connect to APP STORE and i get an error message "App Store cannot verify a secure connection with the App Store. Do you wish to continue?" Can somebody help?

Can you connect to any other wireless network?

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    Back up all data before making any changes.
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    Take all the applicable steps in this support article. If you're running OS X 10.8.4 or later, run Wireless Diagnostics and take the remedial steps suggested in the summary that appears, if any. The program also generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
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  • My ipod touch 5 is frozen on the lockscreen and i cant do anything except restart it and that doesnt hekp. will getting a new screen help? or is there another, less exspensive way? also, it is not connected to wifi.

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  • HT4623 I HAVE TRIED TO UPDATE SOFTWARE AND THE VERIFICATION SAYS I AM NOT CONNECTED TO WIFI BUT YET I AM SAFARI IS WORKING FINE

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  • My IPhone 4s will not connect to wifi, what can I do?

    My IPhone 4s will not connect to wifi, what can I do?i have tried network reset, turning wifi off and on but my phone will not connect to any network.

    Hi jazznola9,
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  • Since updating my airport utility app to iOS 8, it can no longer see my base station and will not connect to wifi.

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