The unit appears to be functioning normally:
It obtains an IP address via DHCP.
It responds to ping.
The web configuration interface is fully accessible and all configuration pages work correctly.
However, the unit is not detected by Meridian Device Manager.
To troubleshoot the issue, I have tested:
Meridian Device Manager v52
Meridian Device Manager v64
Meridian Device Manager v65
on two different Windows 10 PCs, with the same result.
I also performed packet captures using Wireshark. The captures show that:
Meridian Device Manager sends SSDP M-SEARCH discovery requests.
The Meridian 271 does not send an SSDP Search Response.
The HTTP server on the 271 works normally, and the unit communicates correctly over the network.
I have also performed a factory reset from the web interface, but this did not resolve the issue.