Quote:
is that 152.xxx ip address range correct?


Yes

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Invalid argument or cannot assign requested address ?? What in the world ... What specifically is the value in the unicast address field in options?


The "Connections Options" specific address is:
152.78.192.74

Pinging this extract string works fine:
[rsc@capella ~]$ ping 152.78.192.74
PING 152.78.192.74 (152.78.192.74) 56(84) bytes of data.
64 bytes from 152.78.192.74: icmp_seq=0 ttl=255 time=0.672 ms
64 bytes from 152.78.192.74: icmp_seq=1 ttl=255 time=0.664 ms

Quote:
The FC4 installation notes suggest that users upgrade their JRE to the latest 1.5_04 distribution from Sun


I gave the 1.4.2 output as I knew that was working fine in FC1... as I mentioned earlier 1.5.0 also isn't working, but I didn't use it in this test in case it was a secondary issue of using 1.5.0! Anyway, 1.5.0 doesn't give much in the way of debug output:

[rsc@capella lib]$ java -fullversion
java full version "1.5.0_04-b05"

[rsc@capella lib]$ java -Ddebuglevel=30 -jar jemplode.jar
SSDPDiscoverer.startDiscovery0: null
SSDPDiscoverer.startDiscovery0: capella/152.78.192.72
SocketConnection (10923757): actually open

Does "actually open" mean "already open" or "OK, it's open" ??

Thanks for your help so far,
Ross