Mac App Store Stuck - Cannot Sign In

Hello,
I've recently upgraded my Mac OS X from 10.6.2 to 10.6.6 .
Now the App Store is installed and shown in my dock , but I can't use it because it cannot connect to iTunes Store .
When I open the Mac App Store , "Connecting to iTunes Store ..." appears after a few seconds but it really does not do any other actions .
The main problem is that I can't even sign in with my Apple ID . When I click "Sign In" from the "Store" menu , the login form appears . After entering my Apple ID and password , the loading icon appears , and the applications sticks in this situation ( nothing happens after that ) .
Maybe I should notice a few things :
* I'm sure that I have an active Internet Connection and there's no problem with it .
* I'm not using FruitMenu and similar applications ( which makes problems for App Store and are already discussed in similar topics )
* I'm not using any firewall or something similar that prevent app store from any connections .
* I already tried opening iTunes manually ( as described before ) but nothing changed .
* I tried signing in with other Apple IDs and the same error occurred .
* I can use my Apple ID in iTunes Store , Apple Developer Section , ... without any errors .
* I'm sure that I'm not making mistake in entering ID and Password .
* I was monitoring my network activity and I found out that no request or packet is being sent by App Store application through Internet ( after the application sticks in that situations )
* I quitted every other apps while doing this , but nothing changed .
* I'm using iTunes 10.1.2 and App Store 1.0 (54)
Any ideas and helps are really appreciated ... ( I really need this )
Thank You

Do you repair permissions ever?
Try downloading the Mac OS X 10.6.6 Combo and manually applying it;
http://support.apple.com/kb/DL1349
I would repair permissions before and after the installation.
Also you could use iTunes to sign into your account and reset all notifications in your account info section. After opening the iTunes Store click your Apple ID in the upper right, enter your password and view account. At the bottom of the page you will find the reset button.
Dah•veed

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edited by: cs

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hi.
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When I open the MAS, I get a "Cannot Connect to the App Store" alert in the window.
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When I click on the Network Diagnostics button presented and go through the diagnostic, my network reports operating perfectly.
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If you’re having trouble using App Store, try these solutions:
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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)

Hi ..
Fist, uninstall Fingerpop beta > http://www.finderpop.com/manual/210/title.html
"/Library/ScriptingAdditions/SIMBL.osax"
Next, open a Finder window. From the Finder menu bar click Go > Go to Folder
Type this exactly as you see it here:
/Library/ScirptingAdditions
Click Go
Move the SIMBL.osax files from the ScriptingAddtions folder to the Trash
Try the App Store.
edited by: cs

I can't download anything on the Mac App store. It says This Apple ID cannot be used for the Mac App Store.

I can't download anything on the Mac App store. It says This Apple ID cannot be used for the Mac App Store.

I went into settings, iTunes & App Store and tapped on my appleID, then signed out. I went back into the App Store on my phone and tried to download the app and then signed in again, and it worked!

Cant sign into Mac app store

Hi
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No its just a "unknown error"
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I cant sign in, in mac app store

hello
i want to sing in in mac app store !
but i receive this message :
"Your device or computer could not be verified. Contact support for assistance."
Of course i have not problem with sign in in iTunes !!!
version of my mac :10.6.8

same junky iphone problem....i have asus computer works fine..all up to date...i have ijunk3gs updated latest ios worked fine...after the update i lost some spps that didnt sync so i went to app store ..worked fine..redownloaded..BUT as of this past week i try to sign in and get...unknown error after i enter password....so i try resync and check for latest software...all good..i log in on i tunes on computer and it logs me in .....now when people start saying delete this or download that...i say F that,thats not my job....i will find out how man(FEW) months i have on contract and switch a ANOTHER PHONE THAT WORKS....IPHONE IS JUNK

My iPod touch 4th gen. Keeps giving me the error message "cannot connect to the app store when I sign in. I can open the app store and browse it but I can't download anything. I have full signal strength with my wi-fi and safari is working perfect.

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I cannot to download from the mac app store (There was an error in the App Store. Please try again later. (20))

I cannot to download from the mac app store (There was an error in the App Store. Please try again later. (20))
I traied to remove cookies and still don't working.

Regretably, none of the above solutions has resolved this problem for me.
Whenever I try to perform updates (in my case, Xcode and iPhoto both want to update), I receive the following error:
An error occurred during purchase.
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Mac App Store Stuck - Cannot Sign In

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