QuickBooks 2010

I have a client on a network. Two users are using QuickBooks Premier Professional 2010. User #1 has the database on his computer. User # 2 access that file from her workstation (multi-user mode).

Up until two days ago User#2 routinely backed up the company file to her workstation. (Company file on #1, back up file on #2). When #2 attempted a backup yesterday, she received a nondescript "Failed" error. She tried it again today with the same result. User #1 can't even open the file. It starts to open, the Company file name appears on the top of the QuickBooks window, then fails with a "connection has been lost error. Then, after several seconds, anotother error appears. "Unexpected Error". C-343.

I registered the MSXML.DLL files.  (Regsvr32 MSXML3.dll & (Regsvr32 MSXML4.dll, but that did not help.

The file size is 311MB.

Thanks in advance for your help.
mapalaska2003Asked:
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JohnBusiness Consultant (Owner)Commented:
First, User 1 should be backing up the database (it is on User 1's computer). User 2 should NOT be doing this because the network activity (chatty QB data base) could have damaged the database. That looks to be the issue here.

Now, work only with User 1 for the next part.

Make a copy of the QB database somewhere safe. QB needs to be closed for this.

Open QB and go File, Utilities and turn OFF Host Multi User Access.

Now try to open the file locally and see if it opens. Let us hope so.

Assuming it opens, run File, Utilities, Rebuild data base. Allow that to occur. Then switch back to Host Multi User Access and see if it opens .

If you cannot open the data base locally or any way at all, you may need to call Intuit Support.

NOTE: Whenever you have QB open, always close the company file BEFORE closing QB. Sometimes, opening QB with no file open and then navigating to the file with the big center Open Company button will open a troublesome company file.
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mapalaska2003Author Commented:
Thanks John. I'll give that a try.
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