I relaxed the permission to allow Java in my Firewall - this restored the access and the system worked as expected.
Now I have to sort out why Windows Media Player gives the message:-
Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.
You've encountered error message C00D1199 while using Windows Media Player.
Problem signature:
Problem Event Name: APPCRASH
Application Name: mplayer2.exe
Application Version: 6.0.2.902
Application Timestamp: 35ed5db7
Fault Module Name: mplayer2.exe
Fault Module Version: 6.0.2.902
Fault Module Timestamp: 35ed5db7
Exception Code: c0000005
Exception Offset: 000075a3
OS Version: 6.0.6002.2.2.0.768.3
Locale ID: 2057
Additional Information 1: e56f
Additional Information 2: 59ecf43caac5e35353d04523d1e0c63a
Additional Information 3: 6e3c
Additional Information 4: d192f7848dd7030585266dd2123e3c32