i dont think its the problem of fixpack because it worked before. I faced this errror yesterday only for the very first time.
db2diag has got the below message:
2009-05-05-10.06.37.648000+330 I3427H398 LEVEL: Info
PID : 3244 TID : 7820 PROC : db2look.exe
INSTANCE: DB2 NODE : 000
EDUID : 7820
FUNCTION: DB2 Common, Security, Users and Groups, secLoadClientAuthPlugin, probe:10
DATA #1 : String, 91 bytes
Loaded plugin library C:\PROGRA~1\IBM\SQLLIB\security\plugin\IBM\client\ IBMOSauthclient.dll
2009-05-05-10.06.37.648000+330 I3827H335 LEVEL: Info
PID : 3244 TID : 7820 PROC : db2look.exe
INSTANCE: DB2 NODE : 000
EDUID : 7820
FUNCTION: DB2 UDB, bsu security, sqlexLogPluginMessage, probe:20
DATA #1 : String with size, 37 bytes
db2secClientAuthPluginInit successful
2009-05-05-10.06.37.976000+330 I4164H479 LEVEL: Info
PID : 3244 TID : 7820 PROC : db2look.exe
INSTANCE: DB2 NODE : 000
APPID : *LOCAL.DB2.090505043637
EDUID : 7820
FUNCTION: DB2 UDB, DRDA Communication Manager, sqljcReceive, probe:30
MESSAGE : ZRC=0x8136001C=-2127167460=SQLZ_RC_NO_CONNECTION, SQLT_SQLJC
"No connection"
DATA #1 : String, 11 bytes
CCI Error:
DATA #2 : unsigned integer, 4 bytes
71
2009-05-05-10.06.37.976000+330 I4645H479 LEVEL: Info
PID : 3244 TID : 7820 PROC : db2look.exe
INSTANCE: DB2 NODE : 000
APPID : *LOCAL.DB2.090505043637
EDUID : 7820
FUNCTION: DB2 UDB, DRDA Communication Manager, sqljcReceive, probe:30
MESSAGE : ZRC=0x8136001C=-2127167460=SQLZ_RC_NO_CONNECTION, SQLT_SQLJC
"No connection"
DATA #1 : String, 11 bytes
CCI Error:
DATA #2 : unsigned integer, 4 bytes
71