Unfortunately, the RP config files were for various clients and I don't have any full config files that I'm at liberty to share. I can share a partial config, however, and this may be enough to get you going down the right path:
Code:
ProxyPass /otm/ http://otm55prod.company.com
ProxyPassReverse / http://otm55prod.company.com
ProxyPassReverseCookiePath / /otm55prod/
This would require the URL Prefix in the OTM glog.properties file to be set to "/otm". Keep in mind that once OTM is configured for RP access using the URL Prefix, you won't be able to connect to it directly and get full screens.
BTW - I have run across one client no who is using WebSphere as a RP and it is working. Unfortunately, the same applies - can't share their data, since it is client specific.
--Chris