We are having the exact same problem - and is only on 8 of our 131 servers.
Symantec support is not helping us much, and gives the same answers that everybody else gets.
We are seeing this problem on SMSDOM version 5.1, 7.5.5 and 7.5.7 and on Domino 7.0.3 Fp1.
All 131 servers in our environment is Win2003SP2 and Domino 7.0.3fp1, but it is only 8 which fails.
The 8 servers with problem have 2 things in common that differ from the rest of our servers:
1) They are IBM x346 servers
2) They have all been installed in April 2009 with Win2003 SP2
This is what we have tried so far:
* Followed the Symantec procedure from the tech note - every version since 31/8
* Upgraded SMSDOM from 5.1 to 7,5
* Upgraded SMSDOM from 7.5.5 to 7.5.7
* Uninstalled SMSDOM & SAV.CO.10 and reinstall both
* Run Liveupdate against internal live server
* fixup on sav.nsf
* fixup on 4 mailboxes
* deletion and recreation of 4 mailboxes
* Enabled debug in SMSDOM
NOTHING HELPS....
The last line in the debug file (navtask0.err) is always the following at hang time:
SMSDOM DEBUG [1] Loading scheduled LiveUpdate settings.
SMSDOM DEBUG [1] Creating Scheduled LiveUpdate object for Server Group [DKDDB04 Mail Servers].