We have an internal HTTP website on the corporate LAN that is protected by an auth-proxy (HTTP). This all works and functions correctly when accessed internally from the corporate network.
We have an issue in that we have some home workers that connect to the corporate LAN via Cisco 827 ADSL routers. They can connect to the LAN correctly and use internal resources. However, when attempting to access this particular site that is protected by the auth-proxy after a brief pause a 400 error is returned to the browser.
Usually a 400 error refers to 'Bad Request'. Having performed some debugging on the router that is performing the auth-proxy, the actual username is being passed from the user browser to the proxy router, however nothing further happens apart from the error.
My question would be then, has anyone ever seen this issue, The captures don't seem to indicate much difference from internal and external users in terms of the data sent for authentication.
Is it possible that the ADSL router is somehow malforming the request which the proxy router then can not read ?
Any assistance would be appreciated here.