The following is a quick 2 step guide to determing which http port have been chosen.
On a LINUX PLatform - a standard RVD daemon has been launched against TCP listening port 8188
1. To obtain the process id of the rvd daemon
$netstat -ap | grep 8188
---
tcp 0 0 *:8188 *:* LISTEN 4132/rvd
2. With the process id (4132) query using netstat again
----
[rlucas@koffing ~]$ netstat -anp | grep 4132
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0
0.0.0.0:8188 0.0.0.0:* LISTEN 4132/rvd
tcp 0 0
0.0.0.0:35166 0.0.0.0:* LISTEN 4132/rvd
----
Here the general rule of thumb is the second TCP listing (35166) will be the http interface value.