Users unable to sign-in to Citrix web interface

We have an new MetaFrame installation with multiple Active Directory trusted domains. The domain where the Citrix install is located has a group with all the accounts from the other domains, and that is the Citrix access group. The problem where experiencing is that some of the users located in these other domains cannot login, and receive the following error message:
"The supplied credentials could not be validated. Either they are incorrect, or there is a problem with the authentication system. Try again, or contact your help desk or system administrator for help."

The logs on the server show the following:
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Security:
Event Type:      Failure Audit
Event Source:      Security
Event Category:      Logon/Logoff
Event ID:      533
Date:            6/23/2008
Time:            3:11:48 PM
User:            NT AUTHORITY\SYSTEM
Computer:      VECTORABWCTX
Description:
Logon Failure:
       Reason:            User not allowed to logon at this computer
       User Name:      DELETED
       Domain:            DELETED
       Logon Type:      2
       Logon Process:      Advapi  
       Authentication Package:      Negotiate
       Workstation Name:      VECTORABWCTX
       Caller User Name:      NETWORK SERVICE
       Caller Domain:      NT AUTHORITY
       Caller Logon ID:      (0x0,0x3E4)
       Caller Process ID:      2348
       Transited Services:      -
       Source Network Address:      -
       Source Port:      -

Application Log:
Event Type:      Error
Event Source:      Web Interface at c:\inetpub\wwwroot\Citrix\MetaFrame
Event Category:      None
Event ID:      0
Date:            6/23/2008
Time:            3:11:48 PM
User:            N/A
Computer:      VECTORABWCTX
Description:
All of the configured XML Services for farm "VECTORAGRESSO" failed to respond to this XML transaction. [Log ID: d69893f9]

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

AND

Event Type:      Error
Event Source:      Web Interface at c:\inetpub\wwwroot\Citrix\MetaFrame
Event Category:      None
Event ID:      0
Date:            6/23/2008
Time:            3:11:48 PM
User:            N/A
Computer:      VECTORABWCTX
Description:
An error of type "IMA" with an Error ID of "0x80000001" was reported by the XML Service at address "http://VECTORAGRESSO:8080/scripts/wpnbr.dll [com.citrix.xml.NFuseProtocol.RequestValidateCredentials]".  This XML Service transaction failed, but the XML Service has not been removed from the list of active services. [Log ID: 95c63b05]

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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Now all the errors are recorded around the same time, so I believe there related. I've done some digging and figured out this all seems to be related to the citrix XML service.






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