Hello. I just completed development of a SharePoint site on a virtual server and am currently in the process of granting users from a different domain to the site. The SharePoint domain is SHAREPOINT, and the domain with the users I want to give access to is COMPANY. I have provided them with a link to the site and added them as users via SharePoint, which is all I thought I would need to do. However, when they go to the link, the site shows them a SharePoint error page.

In the security event log, I am showing the following:

Event Type: Failure Audit
Event Source:   Security
Event Category: Object Access 
Event ID:   560
Date:       3/18/2010
Time:       11:11:49 AM
User:       COMPANY\ThisUser
Computer:   SHAREPOINT
Description:
Object Open:
    Object Server:  Security Account Manager
    Object Type:    SAM_ALIAS
    Object Name:    DOMAINS\Account\Aliases\00000404
    Handle ID:  -
    Operation ID:   {0,1719489}
    Process ID: 416
    Image File Name:    C:\WINDOWS\system32\lsass.exe
    Primary User Name:  SHAREPOINT$
    Primary Domain: COMPANY
    Primary Logon ID:   (0x0,0x3E7)
    Client User Name:   ThisUser
    Client Domain:  PRINTRON
    Client Logon ID:    (0x0,0x1A3BC2)
    Accesses:   AddMember 
            RemoveMember 
            ListMembers 
            ReadInformation 

    Privileges: -
    Restricted Sid Count:   0
    Access Mask:    0xF

Then, four of these in a row:

Event Type: Failure Audit
Event Source:   Security
Event Category: Object Access 
Event ID:   560
Date:       3/18/2010
Time:       11:12:08 AM
User:       NT AUTHORITY\NETWORK SERVICE
Computer:   SHAREPOINT
Description:
Object Open:
    Object Server:  SC Manager
    Object Type:    SERVICE OBJECT
    Object Name:    WinHttpAutoProxySvc
    Handle ID:  -
    Operation ID:   {0,1727132}
    Process ID: 404
    Image File Name:    C:\WINDOWS\system32\services.exe
    Primary User Name:  SHAREPOINT$
    Primary Domain: COMPANY
    Primary Logon ID:   (0x0,0x3E7)
    Client User Name:   NETWORK SERVICE
    Client Domain:  NT AUTHORITY
    Client Logon ID:    (0x0,0x3E4)
    Accesses:   Query status of service 
            Start the service 
            Query information from service 

    Privileges: -
    Restricted Sid Count:   0
    Access Mask:    0x94

Any ideas what permissions I need to grant to the user to get them access to SharePoint?