ICal can't log in now in MacOS Lion

I have been using iCal to see my work calendar (a CalDAV server stbeehive.oracle.com) in MacOS X 10.6.8 for a long time. After upgrading to MacOS Lion, I get the following error
"iCal can't log in to your "[email protected]" account because your password may be incorrect. The password may have been entered incorrectly."
I have entered the correct password many times. I have successfully logged into my work email account with the same password in the Mail program, but for some reason I can't log in to the CalDAV server with the same password. I can access the calendar with the same password on my iOS5 devices (iPads and iPhones).
Any ideas for a workaround?

This worked for me.
http://support.apple.com/kb/TS4000?viewlocale=en_US
Specifically...it's will give you a scary screen saying everything on your machine will be deleted, but I jumped right into it and said "bring it". worked.
Turn iCloud Calendar off and back on
Quit iCal.
Choose System Preferences from the Apple () menu and click iCloud.
Remove the checkmark in the checkbox next to Calendars.
Close System Preferences and wait about a minute.
Open System Preferences and choose iCloud.
Replace the checkmark next to Calendars.
Close System Preferences.
Open iCal and test to see if the issue has been resolved.

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ICal can't log in to you "iCloud" account ...

I have a second MBP that I am syncing to iCloud and when after the initial calendar download from the iCloud server, it won't allow any changes or updates and gives me the following message:
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Could you please amend your signature to prevent this sort of confusion.
Try signing out in System Preferences>iCloud and signing back in again. Your iCloud data will disappear but will return when you sign back in.

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I ran into the issue about 3 months ago and resetting my password fixed the issue (no pop-ups since the reset). As someone who supports about 25,000 users who are on Google Apps for Education I can comfortably say that this appears to be a pretty common fix. About once a week we get a call from a user who gets the username/password pop-up with correct credentials, when I encountered it myself I knew something had to be up.
Give the reset a try, also give it a few minutes (3 to 5 mins) before entering the new password into iCal.

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I was doing homework and the software started lagging, followed by all the font being stuck in caps lock. My keys are find and I could still turn the caps on/off. This had no effect; still caps. I used shift, still the caps stayed on. I restarted it and it pops up with "OS x safeboot" and asks for my password. I type it in accordingly and it's wrong because the caps are still on. I don't know what to do and I have an online test due soon ;( help?

I would first try compressed air to blow anything from under the key. More knowledgeable people will hopefully chime in, but a problem starting at a level as low as logging in would make me think that the contacts under the keys might be dirty. Do you have another keyboard that you can plug in?

ICal can't log in to your "MobileMe" account because your password may be incorrect

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ICal can't log in to your "iCloud" account because your password may be incorrect.

I keep getting this message. please help

I'm running OSX 10.7.4 and I keep getting this message, too. My calendar is sycing, but, often, after I accept a meeting invitation, the meeting disappears from my calendar! So, I have to go back and re-accept the meeting -- and hope I don't get the error message again.
The only thing I have found to work is to quit iCal before accepting a meeting planner. That approach (which is obviously not convenient or user-friendly) doesn't always work, however. I occasionally get the same error message.
I know my Apple ID and password entered on the system are both correct. For one thing, my contacts have synced in Address Book across my devices. It's just iCal that appears to be the problem (again).
Any other thoughts as to what's going on and how to fix avoid this problem?
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Does the help guide help at all?
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Hi,
iChat (it would help to know which version) can accept Apple IDs as valid AIM Screen Names.
However if you have iChat 5 or earlier you cannot use ones ending in @me.com or @icloud.com issued by iCloud. (they can be used in iChat 6 or Messages as these versions make a double login to AIM and Apple to allow the use of the password).
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As it does not need a double check with Apple you can use it to log in to the AIM Web pages
Login here with an AIM Name registered at AIM or and @mac.com name and see if you get any suspended account messages.
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Navigate to Preferences.
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Fnd com.apple.ichat.aim.plist (even if you are using Messages)
Drag the file to the Trash and Restart the app.
7:39 pm Thursday; May 29, 2014
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 G4/1GhzDual MDD (Leopard 10.5.8)
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I was installing a new update on my MacBook Pro. With only 20% left it said "an unknown error had occured, please restart your computer." Now that I've restarted - I can't log in!

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First it asked if I wanted to connect my Mac to a powersource but since I had charged the battery to 79% I didn't think it was necessary. So I continued, computer restarted and began installing the updates.
Everything went fine until it was approximately three minutes left. An error message popped up and said something like "An unknown error has occured. Please restart your computer and try again". I pressed OK, rebooted my computer and when it asked for my password I typed it in. After I pressed OK, the computer indicated it was the wrong password. I tried multiple times and sometimes with different passwords... so now I can't simply log in! What's the problem?
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Forgot Your Account Password
For Lion/Mountain Lion
    Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     When the menubar appears select Terminal from the Utilities menu.
     Enter resetpassword at the prompt and press RETURN. Follow
     instructions in the dialog window that will appear.
     Or see Reset a Mac OS X 10.7 Lion Password and
     OS X Lion- Apple ID can be used to reset your user account password.

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Hello sadiepix,
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Cheers,
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I upgraded from 10.4.11 to 10.5.0 using a drop in DVD and now I can't log in...

I upgraded from 10.4.11 to 10.5.0 using a drop in DVD and now I can't log in...
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I need help getting past this login screen PLEASE!
The login name is blank and I've tried everything to get past it.
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OK I finally got passed the above problem by just trying to type it in over and over and over and it finally took!
It seems as though I may have typed it wrong or misspelled something but I could swear I put it in the same way everytime!
NOW...
when I type : passwd username
replacing username with the short name it says
paddwd: Unknown user name 'username'
someone told me that possibly the home folder is still there and intact but the login may have gotten trashed and that i may need to recreate the user login. Does that sound like a possibility?

ICal can't log in now in MacOS Lion

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