Everytime i try to open the mac app store it doesn't connect

I've just downloaded the new ios x software mountain lion. I am trying to get a few new apps from the mac app store. However everytime I open the mac app store application it dooesn't start and the error. "cannot connect to the mac app store" appears. Does this have anything to do with Apple currently updating the system or is there really a problem. If there is then can somebody help me out getting it working.

I had found this when I had the same problem:
Close the App Store (make sure to Quit)
Open Keychain Access from the Applications > Utilities folder
Click on System Roots on the upper left panel
Click on Certificates from the lower left panel
Scan through the list of certificates on the right and look for any with a blue “+” symbol overlaid on the icon (these have custom trust settings, which might be wrong).
For some reason just setting them to Use System Defaults doesn’t make the settings apply, so repeat the following steps for all certificates with the blue “+”
Double Click on the certificate to show the info panel
Click on the triangle next to Trust to reveal the Trust settings
Change the Secure Sockets Layer (SSL) setting to No Values Specified
Close the info panel, you should be prompted for the administrators password.
Double Clock on the same certificate again
Expand the Trust settings
Change the When using this certificate setting to Use System Defaults
Close the info panel, and again enter the administrators password.
Repeat this for all of the certificates with the blue “+”
When done, restart the App Store and see if you can access Updates.

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