Universal Media Server | Forum

There is no reason to suspect the firewall or antivirus software when UMS won't start. The firewall is most often the cause when UMS starts fine, but can't be found by renderers. This is probably caused by some issue/bug with the embedded Java, since this is new in UMS 9.0 as far as I understand. I haven't tested it myself, so I don't know the details of how this has been done.

That sounds like a reasonable problem description, and I'd say that the UMS devs must look at how to make sure that the "correct" Java version is used.

We have recently fixed one cause of this so I'm marking this as solved, please let us know if it is still occurring