Screen Sharing does not accept my password anymore

Hi
I have a headless Mac Mini Server running Snow Leopard Server 10.6.8 and a MacBook Pro  running Snow Leopard 10.6.8. I detected this morning, that I'm not able to connect from the MacBook Pro to my Mac Mini over Screen Sharing. All other services, mail server, iCal server, Address Book server, file sharing over SMB or AFP even connecting over VNC do work.
- I select the Mac Mini symbol in Finder
- in column view, I select Share Screen...
- in the connection dialog, I add the password (username is already predefined)
- on connect, I get: Authentication failed to "servername". Please verify you have entered the correct name and password.
I use the same username and password with Server Admin, or logging in locally over VNC so I know this is correct.I'm sure I did not change any settings concerning screen sharing (I did some experiments with WebDAV recently)
I'm not sure, when I used Screen Sharing the last time, is there a log on the server for this? Could be, the problem was introduced with 10.6.8, but I'm not sure. From the logs I see, Screen Sharing did work on July, 16th. This would narrow it down to: iTunes 10.4 (not likely), Migration Assistant Update for Mac OS X SL 1.0, and Remote Desktop Client Update 3.5.1.
On the server, I found the following log entries: Jul 21 20:24:33 servername AppleVNCServer[1362]: no such user: user@LKDC:SHA1.xxxxxx: 2
Any help on this problem?

Sorry if that didn't come out right. I should have taken the time to get the correct labels off of the user preferences dialogue and it would have made more sense.
When you create a new user, there are two fields: one for "Full Name" (typically the user's actual name) and another for "Account name" (this usually a more Unix-like user-id). On my system, typing "John Doe" into the Full Name box automatically populates "johndoe" into the Account Name box. I would guess the majority of Mac users will leave that default in there, type in a password and hint and complete creating the account.
Interestingly, you cannot view the Account name in the user preferences dialogue once the account is created. However, the Account name is used as the name of your Home folder.
In the past, I've used that Account name when connecting to shares in finder. I just verified that when you open finder and click "Connect As" and choose "Registered User," the authentication prompt in SL automatically has the Account name in the user field. Once connected in finder, all I had to do is click Screen Sharing and it would just open up. Presumably since I had already authenticated via finder. After the last updates, I started getting a password prompt only when attempting to start screen sharing. Finder still worked the same as before, and I was able to view all my folders. Using the Full Name instead of the Account name got me through the second password prompt and opened the screen sharing session.
I tried authenticating the finder with the Full Name instead, and still got the second authentication prompt when launching screen sharing. Clearly Apple has made a change to screen sharing that no longer passes through your finder authentication.
If you've somehow already been using the Full Name, and not the Account name, to authenticate in finder, this fix doesn't help you.
What I meant by "feeling stupid" is going to great lengths to step through a lot of troublesome reboots and whatnot, only to discover that the problem is an arcane, and apparently pointless change with which user name on the account authenticates for two apparently related features (you do go through finder to get to screen sharing!). I certainly didn't mean you were stupid. I wouldn't blame you for having to figure out something Apple changed up after years for no apparent reason. I wasn't real happy about it either after wasting an hour or so figuring it out. My poor choice of words was really meant in the spirit of that "d'oh!" moment when you find the trivial 5 second fix after spending that hour (or days) doing lots of potentially risky stuff to no avail.

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