Recently I installed Vmware Server. When I opened the web browser it popped up with an error service unavailable 503. To fix follow the steps below.
First find your tomcat directory. In my instance the directory was C:Program Files (x86)VMwareVMware Servertomcat
Open the /bin folder
Now you need to right click on tomcat6.exe and go to properties. Click on the compatibility tab
Click on the button that says change settings for all users.
You will now see a new window with a single tab labeled compatibility for all users
Check the box that says “Run this program in compatibility mode for:”
That is it now you can start your Vmware service and open your browser.