Cannot Connect to Mac App Store

• When I open the MAS, I get a "Cannot Connect to the App Store" alert in the window.
• When I try to signin, I receive a red "Connection failed" message in the signin dialog box.
• When I go to Software Update from the Apple Menu, I receive a notice that "Software Update can’t connect to the update server. Make sure you’re connected to the Internet, and then try again."
• When I click on the Network Diagnostics button presented and go through the diagnostic, my network reports operating perfectly.
• When I go to an app on the iTunes web-storefront click on the "View in Mac App Store" button, the MAS launches, but I get the same connection error.

I can sign in to the iTunes store. I can update software on my iDevices by using the iOS App Store. I have no problems there. It's just the MAS.

Apple support articles say:

If you’re having trouble using App Store, try these solutions:

• If you see a message that your computer can’t connect to App Store, make sure your Internet connection is working. If you can open a web browser and view a website, there may be a problem with the store. Try using App Store again later. [I've been trying for two days, and there aren't a lot of issues like this on the first page of the discussions section, so I think it's probably not a common error at the moment...]
• Make sure your computer’s date, time, and time zone are set correctly in Date & Time preferences. Choose Apple menu > System Preferences, and then click Date & Time. [These are correct.]
• Make sure your Apple ID information is accurate and that you don’t need to correct a problem with a previous purchase. To verify your Apple ID information and review your purchase history, choose Store > View My Account or click Account in the Quick Links section. [I can't connect in the app, so...]

If you’re still having trouble, click Support in the Quick Links section. [I couldn't find QuickLinks, but no other support article seems to be availlable to help this problem.]

I have restarted my computer, I have removed the App Store with AppDelete and reinstalled from the Lion 10.7.4 Client Combo. I've got no change.

I did notice that the MAS window menu reports the name of the window as "Firenze", which seems weird to me. Can anyone advise me?

kernal.log

Jun 20 00:39:41 MyMachine kernel[0]: 2.4.0 m69d3947c

Jun 20 00:39:41 MyMachine kernel[0]: 2.4.0 f7499348

Jun 20 00:39:41 MyMachine kernel[0]: 2.4.0 m639defac 647 ->Software Update<-

Jun 20 00:39:41 MyMachine kernel[0]: 2.4.0 m1958bd17

Jun 20 00:39:41 MyMachine kernel[0]: 2.4.0 m69d3947c

Jun 20 00:39:41 MyMachine kernel[0]: 2.4.0 f7499348

Jun 20 00:39:41 MyMachine kernel[0]: 2.4.0 m639defac 647 ->Software Update<-

Jun 20 00:39:41 MyMachine kernel[0]: 2.4.0 m1958bd17

Jun 20 00:39:42 MyMachine kernel[0]: Software Update (map: 0xffffff8019bc0f68) triggered DYLD shared region unnest for map: 0xffffff8019bc0f68, region 0x7fff95000000->0x7fff95200000. While not abnormal for debuggers, this increases system memory footprint until the target exits.

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m69d3947c

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 f7499348

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m639defac 660 ->App Store<-

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m1958bd17

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m69d3947c

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 f7499348

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m639defac 660 ->App Store<-

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m1958bd17

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m69d3947c

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 f7499348

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m639defac 660 ->App Store<-

Jun 20 00:39:58 MyMachine kernel[0]: 2.4.0 m1958bd17

Jun 20 00:39:59 MyMachine kernel[0]: App Store (map: 0xffffff801c96e878) triggered DYLD shared region unnest for map: 0xffffff801c96e878, region 0x7fff95000000->0x7fff95200000. While not abnormal for debuggers, this increases system memory footprint until the target exits.

system.log

Jun 20 00:39:39 MyMachine installd[652]: Starting

Jun 20 00:39:39 MyMachine installd[652]: uid=0, euid=0

Jun 20 00:39:41 MyMachine [0x0-0x20020].com.finderpop.fp-injector[328]: FinderPop-beta-x86_64-24209: Patching 'Software Update' 0:5b05b (CF-c)

Jun 20 00:39:41 MyMachine Software Update[647]: Performance: Please update this scripting addition to supply a value for ThreadSafe for each event handler: "/Library/ScriptingAdditions/SIMBL.osax"

Jun 20 00:39:49 MyMachine installd[652]: Exiting.

Jun 20 00:39:58 MyMachine [0x0-0x20020].com.finderpop.fp-injector[328]: FinderPop-beta-x86_64-24209: Patching 'App Store' 0:5c05c (CF-c)

Jun 20 00:39:58 MyMachine App Store[660]: Performance: Please update this scripting addition to supply a value for ThreadSafe for each event handler: "/Library/ScriptingAdditions/SIMBL.osax"

Jun 20 00:41:22 MyMachine [0x0-0x20020].com.finderpop.fp-injector[328]: FinderPop-beta-x86_64-24209: Patching 'System Preferences' 0:5d05d (CF-c)

Jun 20 00:41:22 MyMachine System Preferences[665]: Performance: Please update this scripting addition to supply a value for ThreadSafe for each event handler: "/Library/ScriptingAdditions/SIMBL.osax"

Jun 20 00:41:25 MyMachine Finder[261]: CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.

Jun 20 00:41:27 MyMachine System Preferences[665]: Killed finderpop-daemon

Jun 20 00:41:27 MyMachine com.apple.launchd.peruser.502[179] ([0x0-0x20020].com.finderpop.fp-injector[328]): Exited: Terminated: 15

Jun 20 00:41:27 MyMachine [0x0-0x5d05d].com.apple.systempreferences[665]: FinderPop-x86_64-24209 - removed myself from Login Items (1)

Jun 20 00:41:34 MyMachine installd[681]: Starting

Jun 20 00:41:34 MyMachine installd[681]: uid=0, euid=0

Jun 20 00:41:44 MyMachine installd[681]: Exiting.

Daignostic and Usage:

6/20/12 12:39:40.635 AM Software Update: SWU: scan found 0 products:

com.apple.message.uuid: {Alphanumeric removed}

com.apple.message.domain: com.apple.SoftwareUpdate.time.scan

com.apple.message.signature: FAILURE: (null)://localhost/

com.apple.message.result: failure

com.apple.message.value: 0.63927

com.apple.message.value2: 930.995

com.apple.message.signature2: Software Update

com.apple.message.signature3: SUScanResultCode, 100

6/20/12 12:41:35.190 AM Software Update: SWU: scan found 0 products:

com.apple.message.uuid: {Alphanumeric removed}

com.apple.message.domain: com.apple.SoftwareUpdate.time.scan

com.apple.message.signature: FAILURE: (null)://localhost/

com.apple.message.result: failure

com.apple.message.value: 0.07725

com.apple.message.value2: 116.113

com.apple.message.signature2: Software Update

com.apple.message.signature3: SUScanResultCode, 100

Is it really just a a server down, or is there a bigger problem?

(Couldn't edit profile; change is 12 GB RAM)