Hi everyone, Given the following configuration: WSS 3.0 Site, extended to two zones: http://<internal name>/ - Default Zone with Windows Integrated Security http://<internal name>:81/ - Extranet Zone with FBA Works like a charm. Now, the FBA based Zone shall be provided by means of a reverse proxy. This proxy is a 3rd party product and configured as follows: https://<external name>/ is forwarded to http://<internal name>:81/ Client request are not altered in any way. No link rewriting The strange issue is now that links are scrambled as follows: From the client perspective using the https://<external name>/ URL, links are returned as http://<external name>:81/ So a mixture of both external and internal. The alternate access mappings for the intranet zone is configured as: Internal URL Zone External URL http://<internal name>:81/ Extranet https://<external name>/ http://<external name>/ Extranet https://<external name>/ Can anyone give me an enlightment on this? Thanks everyone, Regards Joerg Fischer Jrg Fischer

Start with this link on using the IISlogs to troubleshoot this. The title seems a little off topic but the troubleshooting steps will help. http://support.microsoft.com/kb/2000283 This blog elaborates a bit more on it http://blogs.msdn.com/b/rodneyviana/archive/2009/06/24/blobcache-will-not-work-if-the-request-url-is-not-in-the-alternate-access-mapping-list.aspx Also take a look at http://blogs.msdn.com/b/sharepoint/archive/2007/03/06/what-every-sharepoint-administrator-needs-to-know-about-alternate-access-mappings-part-1.aspxFred Ellis - MSFT