Unable to increase JAVA heap memory solr-6.6.2

[david payne]

I increased the heap mem on our dev, qa and stage solr installs in solr.in.cmd 
from 1024 to 2048. Worked fine. When I increase on our 2 production servers, 
after I restart the Solr service, the admin console will not render.  I change 
it back to 1024 and can browse to console.