I have a satellite receiver PVR connected to my home LAN. Its hard drive
has MP3s, JPGs and .ts files recorded from the satellite broadcasts. For
the past few years I have been able to access these files, play or
transfer them, with the other computers on the network, Windows 7, 8 and
10 (1809). I updated the Windows 10 machine from 1809 to 1903 yesterday
and, when trying to access files on the satellite box, I now get a message:-

"\\10.1.1.16\storage\HDD is not accessible. You might not have
permission to use this network resource, Contact the
administrator.........."

Still no problems accessing the satellite box with the computers using
the older OSs, but something has changed between 1809 and 1903 with
Windows 10.

The satellite box doesn't give me any facility to adjust permissions so
I'll need to change something in my Windows 10 to gain access again.

Anyone got any ideas?