DLNA server not visible on the network - surprising solution
Just wanted to share this as someone may face the same issue as I did.
Long story short, I had serviio configured on my computer as a service and never had issues playing files on my Panasonic TV. All of a sudden I just could not discover the server anymore. Thought it might be related to a new router with OpenWrt - tried couple of things to no avail. Then in desperation I upgraded serviio to a new point version, with no luck. Started digging in the console and it turned out that the issue lied in Bound IP Address setting in the Status section. I had it set to automatic and probably Serviio got confused by VMware and VirtualBox interfaces. I selected my real Eth interface and voila - all started working again.
Hope that helps someone in the same situation - just registered after being a serviio user for good couple of years, to share my experience.
Cheers
Greg