<p>Is it possible to configure Windows Servers that reside on the same domain such that when a web service call is made from a web app using an IP address, the request does not go via a proxy server?</p>

<p>The web service is running on one of the servers on the domain. </p>

<p>I want to configure IP based security on the server that hosts the web service such that it only allows connections from specific servers.  Currently all requests go via the proxy server rendering IPSec problematic.</p>

<p>Within the browser I can specify that requests following a specific pattern should bypass the proxy server.  It's essentially this behaviour I want to replicate with the servers.</p>

<p>Thanks</p>

With ASMX the proxy can be set on the Proxy property:
http://johnwsaundersiii.spaces.live.com/blog/cns!600A2BE4A82EA0A6!435.entry
With WCF, this is part of the binding configuration:
http://blogs.infosupport.com/porint/archive/2007/08/14/Configuring-a-proxy_2D00_server-for-WCF.aspx