I came across this the other day and you can manually edit some settings in the httpd.conf file on the apache server.
For the UMP DMZ, you need these ProxyPass statements in the httpd.conf file for the Apache DMZ:ProxyPass / ajp://<internal UMP IP>:8009/ProxyPass /c/portal ajp:// <internal UMP IP>:8009/c/portalProxyPass /web/guest ajp:// <internal UMP IP>:8009/web/guest
From what I am aware this appears to solve the issue with the redirection to an internal address. However, depending on how you have the layout configured you may need to add the licences to the DMZ hub if it has its own distsrv.
For your information, we run UMP 2.0 with a Linux reverse proxy and it works faster than a windows one (Moreover it's free).
We have installed a lot of this configuration for our customers and it works really fine ..
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