I am trying to setup ISA to act as a reverse proxy for multiple SharePoint servers - the redirection to the correct server should be done by a predefined url fragment as follows:
http://externalurl/sites/Server1
/... -> goes to SharePoint server 1http://externalurl/sites/Server2/
... -> goes to SharePoint server 2
There is also a SharePoint mapped to the root of the ISA, which responds directly to http://externalurl/
The problem is that the Server 1 and Server 2 SharePoint servers are trying to retrieve images, stylesheets and javascripts sometimes from the /_layouts folder which is mapped on the root, and therefore ISA will redirect the request to the root SharePoint server.
How can I avoid this situation? Is there perhaps a means to configure ISA to redirect based on a client session rather than individual http requests?