Hi Pob,
It means that the user MyDomain\UserTFS1 does not have the permission to access the sharepoint site.
Login as administrator,
Open
http://server1/Sites/WEB-AP, Click Site Action -> Site Setting
On Site Setting Page, click People and Group
Add MyDomain\UserTFS1 in
People and Groups Page, give him read permission or other.
Best Regards,
Ruiz
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Sincerely,
Ruiz Yi