i have no clue. it isnt a fresh install anymore, because you deleted the previous installation. on what os are you running Wowza?
im running it on a ubuntu server and only installed the OpenJDK 64bit
why are you running webmin and wowza on the same server? just curious
on uninstall you missed a step (see page 27)
https://www.wowza.com/resources/WowzaStreamingEngine_UsersGuide.pdf
what you did:
cd /usr/local
sudo rm –f WowzaStreamingEngine
you forgot this one:
sudo rm –rf /usr/local/WowzaStreamingEngine-4.0.0
one of them is a symbolic link if i remember, but im not sure.
so please follow the uninstall procedure step by step and try the reinstall again. this might can cause your problem, but im not sure.
if this isnt working i will clone my vm and will give it try with uninstalling and reinstalling to see if i can reproduce your problem. i dont have webmin though.