collect data fail after es_restore

I check an agent history.log , it is OK If I open the Data Collection Window in PRM I see a Yellow triangle before all clients. Except smc server. How can I check what happen ?
[197 byte] By [leeuuileeuui] at [2007-11-26 6:01:23]
# 1
I can check client status in server.But I can't collect data in performance report manager.what's log that I can monitor ?Or what can I check ?
leeuuileeuui at 2007-7-6 13:23:35 > top of Java-index,Administration Tools,Sun Management Center...
# 2
I check taskreq.logoperation data collect has failed on target xxbmr01-mgt:1161 exception was thrown EOF exception: nullexception message :EOF exception
leeuuileeuui at 2007-7-6 13:23:35 > top of Java-index,Administration Tools,Sun Management Center...