Here is my approach. I have assumed you are using IBM HTTP Server (IHS) and not Microsoft IIS.
You will notice that I have set the document root for the virtual host to the "owhtml" folder. This folder contains index.html. Index.html contains a redirect instruction that points the browser to /jde/E1Menu.maf.
# Directory Security
# This is not required for the redirect but is good security practice
<Directory "C:\Program Files\WebSphere\AppServer\installedApps\YourServer\EA_JS_81.ear\webclient.war\WEB-INF">
Order Deny,Allow
Deny from All
</Directory>
<Directory "C:\Program Files\WebSphere\AppServer\installedApps\YourServer\EA_JS_81.ear\webclient.war">
Order Deny,Allow
Allow from All
</Directory>
LoadModule was_ap20_module "F:\WebSphere\AppServer/bin/mod_was_ap20_http.dll"
WebSpherePluginConfig "F:\WebSphere\AppServer/config/cells/plugin-cfg.xml"
# This uses mod_alias to redirect port 80 to port 81 (if the user
# requests
http://e811web with no port). I have only configured this
# under IHS 2. mod_alias may work under IHS 1.3 but I strongly
# recommend using IHS 2 for reasons of stability, performance and the
# availability of mod_deflate compression.
Listen 80
NameVirtualHost e811web:80
<VirtualHost e811web:80>
Redirect /
http://e811web:81
</VirtualHost>
# This is the actual JAS instance on port 81
# The document root is what achieves the redirect
# to /jde/E1Menu.maf
Listen 81
NameVirtualHost e811web:81
<VirtualHost e811web:81> DocumentRoot "F:\WebSphere\AppServer\installedApps\E811WEB\EA_JS_81.ear\webclient.war\owhtml"
Alias /jde "F:\WebSphere\AppServer\installedApps\E811WEB\EA_JS_81.ear\webclient.war"
</VirtualHost>
Hope this helps,
