Hr=80004005 ERR:OpenDB Failed Getting Pub Version 28627

I am getting the error "Hr=80004005 ERR:OpenDB failed getting pub version 28627" in the SQLCESA30.LOG log file in the "C:Program FilesMicrosoft SQL Server 2005 Mobile EditionServerSqlMobileReplication" directory - the directory set up as the Virtual Directory in Internet Explorer. This occurs when I try to set up a .sdf file to be replicated to a SQL Server 2005 Mobile database (I'm following the instructions from the Microsoft Tutorial - http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnppcgen/html/med302_msdn_sql_mobile.asp).

In the UI, when I attempt to set up a new Subscription (setting up my publication goes without any problems), I get an error. It occurs at the last step of the "New Subscription" step on "Synchronizing Data (100%)" / "In Progress" and reads as follows:
TITLE: Microsoft SQL Server Management Studio------------------------------Failure to connect to SQL Server with provided connection information. SQL Server does not exist, access is denied because the SQL user is not a valid user on the SQL Server, or the password is incorrect.HRESULT 0x80004005 (29060)
I have set up the snapshot directory, and given the IUSR_[machine name], and IWAM_[machine name], and Administrator users full access to the works. I have given Full Access for Share permissions for this folder as well. When running http://MYBOX/SqlMobileReplication/sqlcesa30.dll?diag from either Firefox or IE, there are no problems (I do get 8.0 Database Reconciler FAILURE 0x80004005, however I'm not using SQL Server 2000, so it shouldn't matter).

I don't believe it's a file permissions problem, because each time I access the URL, an entry is made in the SQLCESA30.LOG file as follows:
2006/01/07 12:53:16 Hr=80004005 ERR:OpenDB failed getting pub version 28627

I've tried running the wizard with the Administrator account, the sa account, and even setting the IIS Virtual Directory to use the Administrator account as the account that Anonymous users run under. I've also set up both TCP/IP and Named Pipes to accept remote connections using the Start Menu ‡’ Programs ‡’ Microsoft SQL Server 2005 ‡’ Configuration Tools ‡’SQL Server Configuration Manager. I've tested this connectivity from another box using the osql command. The connection succeeded. I've even tried regenerating the snapshot, then checking file permissions on the snapshot, but I find no problems (the snapshot generates correctly, and permissions to the IIS User allow read).

I have configured the publication's "Publication Access List" to include every single account that exists in SQL Server, but it still doesn't work.

According to MSDN, error 28627 is a "Client Agent Error" which means SSCE_M_OPENSQLSERVER - "Failure to open SQL Server with given connect string." I'm setting the logon password as the [sa] account in the last step of the Subscription wizard, though. Further, I've configured the SQL Server Agent to run as the Administrator account on my machine (which is both the Publisher and Subscriber at this stage), and I have configured Administrator to have db_owner in each database.

What am I doing wrong?