Ran into an issue the other day on where we had to change the default http port on OnCommand Core 5.0 package from NetApp. Basically when changing the port the system prompts you to do a:
dfm service stop http dfm service start http
If you only do this then the images still point to the old http port. What actually needs to be run is:
dfm service stop dfm service start
to fully restart oncommand.