We're operating Server 2012 Essentials (Server 2012E) as a home server on a Dell PowerEdge T330. As it is a home server, there is typically only one or two workstations active at any given time. We do utilize the remote access features: VPN, Anywhere Access, and DirectAccess often when away from the home.
The first 1-1/2 years went well when utilizing a Dell Power Edge T300. It incurred minor damage in an electrical storm and rather than repair it, it was more cost effective to replace it with the T330, retaining the Server 2012 R2 Essentials OS. The Serviio DLNA server application fully functioned under Server 2012E when operating on the T300. From the bare metal install on the T330, the Serviio DLNA server has never been fully functional. The DLNA renders would list out on Serviio's console, along with their IP addresses. However, Serviio would never appear on any of the renders. I worked on this issue as time allowed, first checking firewall settings and later the lack of SSDP Serviio broadcasts, but never resolved it.
In the last few weeks, Server 2012E network drives are slow to display on workstations when browsing the network. We also run Windows XP, as a virtual machine, on a Windows 7 workstation. Corresponding with the timing of the slowdown, when the virtual XP starts. we are now receiving an error dialog box in the lower right corner of the XP desktop indicating network resources (a permanently mapped network drive) failed to connect. As the map drive does actually connect, I attributed this error message to the same slowdown.
Again, corresponding with the slowdown, we began to see duplicate listings of network computers in Network Neighborhood. At this point, as I had something more tangible than a slowdown, I began to search out causes/remedies. I found several responses that indicated this issue could be resolved by resetting the network stack utilizing these commands:
netsh winsock reset catalog
netsh int ipv4 reset reset.log
netsh int ipv6 reset reset.log
This resolved the duplicate computer names, network shares speed of display seemed to improve, and for the first time of this installation, the Serviio DLNA server was accessible and fully functional from the renders as well as it's remote console.
This worked for several day and then all the above issues returned. Re-running the netsh commands would again correct the issue, but now for only a few minutes.
So I'm thinking it is an related to these commands, but this is not my area of expertise.