The collector log does not log anything even in debug.
The Juniper NSM collector.log shows the Initialization event, but nothing else is populated to the log. This is still true with the collector logging set to debug.
The collector version is not the same as the Symantec Integration Package (SIP) that is installed on the Symantec Security Information Manager (SSIM). The correct Agent configuration is not pulled down.
Incompatible versions between the collector and SIP
Make sure this is not a collector and SIP version problem. When the collector and SIP versions are not the same, the ucf.log is written to with the following text:
The common bootstrap performed does not remove the agent from the directory, it simply downloads the same credentials the existing instance has in the Directory.
The full bootstrap as outlined in this document actually recreates the agent in the Directory.