De reden is waarschijnlijk dat je inlogt vanaf een systeem wat niet onder hetzelfde domein valt als de SharePoint server. Dat vindt SP niet leuk.
Er zijn meerdere oplossing mogelijk:
Optie 1. Maak gebruik van Forms Authentication (vrij omslachtig voor een SP omgeving).
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Optie 2. Schaf een certificaat aan en volg de volgende stappen:
Extend the Application
Note
Central Administration > Application Management > Create or Extend Web Application > Extend Web Application to Another IIS Web Site
Create a new IIS web site = PortalName.External
Port = 80
Host Header = ExternalName.Domain.com
Path = Leave the Default
Authentication provider = NTLM, unless you have tested Kerberos.
Allow Anonymous: NO
Use Secure Sockets Layer (SSL): NO - Note:There used to be an issue that when you created the site using port 443 you would not be able to assign the Certificate, due to the default port using 443 so the SSL Certificate would not be applied.
URL = ExternalName.Domain.com
Zone = Internet
After Creation go to IIS Manager
Bind to New IP
Set Basic Authentication
Set Real = Internal DomainName Note: Without realm users will need to login withy UserID = InternalDomain\UserName
Apply Certificate
Backup IIS MetaBase
Restart the WSS Application Service
Retore the IIS MetaBase - Note: This will make the changes (IP Binding) stick in SharePoint since SharePoint is not aware of IP Binding and didnt support until after SPS2 SP2
Open Port 443 from the Internet
NAT as Necessary
Voor meer info, zie het volgende blog: http://blogs.msdn.com/joelo/archive/2007/01/02/relationship-between-the-iis-metabase-and-sharepoint-configuration-database.aspx
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Optie 3. Maak gebruik van alternate access mappings. Dit is de eenvoudigste oplossing:
But the simple version is to go in Central Admin / Operations / Alternate Access Mappings (right hand column about three down)
when there specify
Default: http://
Intranet: http://
Internet: http://
If you use internall you don't need to have the Intranet setting.
P.S. It's important waht you use as General. The other settings are just names so it's only necessary for documentation reasons to use Internet for the Internet address etc. you could use any.